> Why are you still using Github?

Because everyone wants the fake internet points (sorry, stars) to mention on their CV.

Because there are already a number of viable alternatives, them not being chosen has nothing to do with AI coding but other factors like market momentum & network effects and familiarity. They are used, just much less so. If there are already good alternatives, why would anyone vibe code a new one any more than they would write a new one manually? Forges are not sexy stuff, and the existence of numerous decent free ones means that you aren't going to be able to sell a new one in any way (paid accounts, stalking/advertising, …) at least not until it has a significant following and that is unlikely to happen because of the reasons above.

People not wanting to use github (or one of the common alternatives that already exist) are more likely to just use git as-is, and other tolls as needed for issue tracking, CI, etc, than to create a new forge.