I was, until now, under the false impression that Android application IDs have to be of the form tld.domain.[...], and hence that you should control a domain to publish an application.

Apparently it is possible to publish applications on Google Play Store without a domain, so I wonder what the App ID would be set to in that case:

• Can I just “assume” a domain? Could I publish com.google.myapp? com.microsoft.myapp? com.example.myapp? This doesn’t seem right because it would make it too easy to “impersonate” established domains. I imagine there would at least be a blacklist in place for some of the “biggest” domains including Google domains, but can everything else really just be “snatched” in terms of App ID?
• If I can’t assume a domain, how should the App ID be constructed instead? Should an “invalid” TLD be used? I see suggestions ranging from using real names to nicknames to email addresses.

This is effectively a follow-up of Do I must own a domain when I publish an android app to Google Play?