

I used to use this app and was quite happy with it: https://play.google.com/store/apps/details?id=com.attidomobile.passwallet
Back then, I was able to download a file (also from ride-ticketing.de) I could then open in any wallet app. Try to see if that’s still an option.
I think the “no screenshots” rule is so that you don’t share your ticket with others via screenshot. In my experience it’s not strictly enforced though - if they can see that the ticket is valid and is yours, they’ll usually allow it.
This is the correct answer. Larger platforms will have some kind of automatic spam filter which autobans accounts that spampost e.g. random links. Any kind of content-related ban often takes slightly longer, because you have to hit the right keywords and a human may have to rubber-stamp it.