I can certainly imagine a lot of companies are tight-lipped about it.
My livelihood depends on an app store and so I'm super cautious about what I say publicly about the company that controls it.
This sort of chilling effect is scary and should rightly be contested.
Epic is criticized for being a huge company themselves and using that as leverage in their legal battle. However, small companies stand absolutely no chance so Epic is the only one that can take this fight.
Epic is the champion of all the smaller businesses with apps on phones. Not because Epic wants them to do well but because Epic wants Epic to do well. They'll just happen to help all of us - consumer and developer - with them.
I'm rooting for them.