Do any fediverse projects currently support social auth?

I think https://github.com/sigoden/dufs is exactly what you want.

It’s still an important distinction IMO

400 million windows devices not users.

For me just using Firefox on Linux seems to be enough to trigger them.

I was talking about the point you made in your first paragraph. Where businesses would suddenly start providing their apps only in third party stores.

If this were to happen it would have happened on Android a long time ago but it didn’t.

I wouldn’t mind ads like these.

I rsync to a storage box from Hetzner.

Good news, they are doing just that (in cooperation with Ecosia)

Edit: And it is supposed to be released this year (as early as Q1 apparently) https://betterweb.qwant.com/en/2024/11/08/ecosia-and-qwant-join-forces-to-develop-european-search-index/