It wouldn't surprise me at all. Pixelfed got mainstream notice, and there's always someone willing to give you money. Pretty much every popular Firefox/Chrome addon developer gets emails about buying it, but those are usually just shady companies looking to push malware onto the existing install base.

Even apart from those, it wouldn't really surprise me to see some VC interest when Pixelfed hit #1 on the play store. They love the idea of glomming onto something that looks like a rocket and trying to ride it to the moon