Apps being rejected was a talking point for the anti-trust investigations for Apple. I don't think Google is quite so famous for its rejections but they were part of that investigation for other abuse, hopefully any changes that come about will apply to them too.

https://www.macrumors.com/2020/08/26/antitrust-investigation...

Perhaps the FTC should have an office dedicated to overseeing policy enforcement for the largest store platforms. There could be a mechanism for saying "hi, I was banned by store X under policy Y but I believe my app was unfairly targeted because Z circumstance and Q other apps should all be treated equally here, including the first party app they're trying to protect..."