umm i think that people are using Ubuntu because of stability and community, and also people get used to of that now even if they try to use some other os they wont be comfortable, there are alooot of different better OS but for those people ubuntu is like their favorite food , I use arch BTW
Old web was more vulnerable because people didn't know many things. Nowadays, everyone is using AI, and you often don't know whether the person you're talking to is a human or an AI. For a normal, non-technical user, the internet is no longer a completely safe place.