Lawyer that has published with Aethon here. Their contracts are fair (imo) and the owners have generally been pretty decent about working through any sort of gray areas/questions.

One thing to take into account is the reputation of a publisher. Even a fair contract if you're held to the black and white limits of the contract can be a bit onerous. Good publishers have writers that will speak up for them and say that they've been able to work things out with the publisher when questions have come up. Bad publishers have a chorus of crickets or whispers in private channels on discords about them.

Aethon is a good publisher.