I think you may be right.
I know people have worked around it in the past using scripting to clear the field periodically, but that was quite awhile ago…before we had user specific fields. My only other thought would be rows specific to each user, but that’s not very viable. Or create a form button to write a record in another sheet with the entered price, then display the record somewhere in your app with a buy button. Otherwise you could create preset donate amounts on separate buy buttons and conditionally show them based on a choice component.
@sardamit can you verify based on your post on this similar situation? Maybe try it in staging with the test credit car?
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