My perspective on this is - To move fast, build product at a good speed, iterate and build new functionalities, to save time - we use 3rd party services after understanding their past record and kind of risk you go into if they stop - there is a silver lining to this.

I think Github is something you can be dependent on. Especially because they have been able to make it a profitable business. They charge for their service.

Whereas - branch.io is free for all. There is no clear business model as such. I would pay them a subscription fee and get a reliable service, rather than have a free unreliable service.