Nah, they had more followers on Mastodon than on Bluesky when they left (and even now). It was because they were getting roasted on Mastodon after CEO’s comments and other stuff like adding a crypto wallet.

Yes, you have to pay to add a domain to the servers. They also probably use the requests data commercially.

You can also easily host your own DNS with Unbound

You probably can, but 99.9% of users won’t.

They could start by making the Steam client be able to run in native Wayland