GitHub is a great platform, which has championed open-source for decades, now. I don’t think anybody has anything to blame them for (except people not liking the idea that AI is trained on their code, like sibling mentioned), it’s more about fears it may go bad. Because basically, it’s where most of the code of the world is hosted, it’s a single point of failure. People also have questioned the pertinence of having all open-source code hosted on a proprietary platform. And the acquisition by Microsoft also had a chilling effect on those of us who remember Internet Explorer 6’s Microsoft more than VSCode’s Microsoft.
For those reasons, it is desirable for those who love the idea of decentralization to look up for alternatives. But even there, it’s perfectly fine to stay on GitHub, “decentralizing” doesn’t require everybody to leave. :) Plus, even when using an other forge, it’s still good to keep publishing mirrors on GitHub for visibility and discoverability, currently.
The good news is that with ircv3 being worked on, it may soon(ish) be quite dusted. :) It adds features like reply threads, history from when you weren’t connected, message editing and deletion, and more!