I'm going to make an assumption and say that you may have strong feelings against Fortnite, and maybe feel as though it has wronged other longstanding titles. This may be incorrect, but regardless your statements regarding Fortnite and Epic Games are a bit misleading.
To begin with, comparing Fortnite to what Valve has been doing lately is a bit strange. Valve has recently focused less on being a developement company and more on their platform/marketplace (Steam) which is the primary driver of their success. Valve in the last few years has been for the most part fairly been irrelevant in the game development industry. A more apt comparison would be Epic and Bluehole (which both created the most popular Battle Royales).
You also state that that Fortnite was both a "failure when it first launched" and "what really made it take off was that you didn't have to pay for the game." Fortnite's Co-Op PvE ran an alpha back in 2014[0], and only entered Early Access in 2017[1] (which cost $40). By no metric was it a failure, and comparing the pre-free to play numbers to after it got popular (with a totally different gamemode) is unfair. Fortnite's free to play battle royale gamemode was not a failure and grew extremely quickly after it's release[2].
What made the game popular with its base audience (initially popular with adults and teenagers and only later being picked up by kids) was the fresh and unique take on a new genre (Battle Royale) that was extremely easy to pick up. It definitely wasn't that they could upgrade their character's cosmetics, a option available in basically every multiplayer. Fornite's financial success does come from selling cosmetics, but implying that cosmetics in video games was an idea developed by Valve is laughable. Sales of virtual goods in video games has a very long history[3].
Fortnite popularized (and capitalized on) a fresh genre, which combined with a low barrier to entry, revolutionized the gaming industry and generated immense wealth for Epic, which struck gold with the game. If it wasn't Fortnite, another well made Battle Royale could have easily overtaken the genre in a similar manner. Fortnite was simply in the right place, at the right time, with the right devs. And they've been rewarded handsomely for it.
To begin with, comparing Fortnite to what Valve has been doing lately is a bit strange. Valve has recently focused less on being a developement company and more on their platform/marketplace (Steam) which is the primary driver of their success. Valve in the last few years has been for the most part fairly been irrelevant in the game development industry. A more apt comparison would be Epic and Bluehole (which both created the most popular Battle Royales).
You also state that that Fortnite was both a "failure when it first launched" and "what really made it take off was that you didn't have to pay for the game." Fortnite's Co-Op PvE ran an alpha back in 2014[0], and only entered Early Access in 2017[1] (which cost $40). By no metric was it a failure, and comparing the pre-free to play numbers to after it got popular (with a totally different gamemode) is unfair. Fortnite's free to play battle royale gamemode was not a failure and grew extremely quickly after it's release[2].
What made the game popular with its base audience (initially popular with adults and teenagers and only later being picked up by kids) was the fresh and unique take on a new genre (Battle Royale) that was extremely easy to pick up. It definitely wasn't that they could upgrade their character's cosmetics, a option available in basically every multiplayer. Fornite's financial success does come from selling cosmetics, but implying that cosmetics in video games was an idea developed by Valve is laughable. Sales of virtual goods in video games has a very long history[3].
Fortnite popularized (and capitalized on) a fresh genre, which combined with a low barrier to entry, revolutionized the gaming industry and generated immense wealth for Epic, which struck gold with the game. If it wasn't Fortnite, another well made Battle Royale could have easily overtaken the genre in a similar manner. Fortnite was simply in the right place, at the right time, with the right devs. And they've been rewarded handsomely for it.
[0] https://www.polygon.com/2014/12/1/7316937/fortnite-alpha-sig... [1] https://www.vg247.com/2017/07/21/fortnite-early-access-has-s... [2] https://www.epicgames.com/fortnite/en-US/news/postmortem-of-... [3] https://en.wikipedia.org/wiki/Virtual_goods#History