I host my own instance and use the Creative Commons Non-Commerical license on my content. The idea is that this makes federation with other non-commercial instances no problem, but as soon as an instance mixes in ads in the feed, they (technically) can't show my posts alongside it.

I know Pixelfed has a license field for every post/picture so you get fine grained control, but I don't believe this is the case for the Mastodon API yet, so I have added the license information in my bio. It would be nice to attach license information to individual posts, and to assign a default license.

My hope is that this will make it more difficult for Meta and the like to mix in ads with my content. Time will tell if it works 😆