Prevent users from signing in to a public app?

Hi all,

One of my apps are made public. 
No user signin required.

About a month ago I shared the link to one of my colleagues.
When he installed appsheet, he also signed in (because he thought he had to), with his private Gmail.

Ofcouse appsheet then shortly after prompted me to buy more licens. I could do that, but in this specific case, the purpose is that no one has to sign in. 
How can I make sure they cannot sign in when the app is public? I find it a bit strange that it is possible to create an app as public, but if people do sign in without your knowledge, you're fined for it? - I mean, in theory. If people forwards the applink, it could be a hugh amount of license?

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