This is a fundamental part of the fediverse, or at least mastodon, right? There can't be an federation without doing exactly this between mastodon instances.
If someone is more concerned about training models on the data and whether that is legal or not, I assume Meta could easily be doing that already if they wanted to via scraping.
Posting on a server that federates doesn’t grant anyone a copyright license to the content you post, regardless of the fact that you can choose a server that doesn’t federate.
[1]: https://www.theguardian.com/law/2025/jun/06/uk-government-si...
Out of curiosity, why did you self-censor facebook? Does it keep the AI away, or something?
Also, most people don’t make money by running an instance of Mastodon. Meta is absolutely using the UGC displayed on their platform to make money.