Not more than it is now. Everything is already public so if they need it, they’ve already been collecting it. This doesn’t really change anything.
And it’s how federation is supposed to work. Either you want to send your content to other instances or you don’t. But federation is the wrong tool if you want to stay alone. You can defederate and block them if you don’t like their terms.
Couldn’t instances or accounts just license their content? Like would it be legally binding if I write in my profile that all the content I wrote here is licensed under a specific CC license?
Genius (the lyrics company) tried to license the content on their website and a judge said that can’t be legally binding because there’s no guarantee the scraper read it. It seems like the same would apply here.
We should open a feature request. An additional license selection field upon posting on Lemmy, or a default setting to license every post and comment from a user account would be awesome. And free/libre culture fits well within this ecosystem.