I've been banned from Google Play Developer portal since 2015 because I had an app that accessed an undocumented API of a 3rd party service: "we have determined that your app interferes with or accesses another service or product in an unauthorized manner." I had two different apps using the same API so I got 2 strikes at once and was immediately banned.
I've tried multiple times to contact Google to get my account restored, several times in the past few years since it's been so long, but they don't even respond and it's impossible to get a hold of a human.