That would be really weird, since if I recall correctly meta funds fediverse projects, I think including Pixelfed. I think they’ve even run an event to help devs, maybe multiple.

Dansup the creator of pixelfed has talked about it and is generally a little more comfortable with meta than I can fully get on board with

(regardless of having generally engaged positively with the Fediverse as far as I’ve seen, they still facilitated genocide, enabled mass misinformation campaigns, exploited people’s privacy, etc.)

Edit: from other comments it sounds like this is just a spam filter for short posts with links, and doesn’t get blocked if the post is longer and/or has an image 🤷‍♂️