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> Maybe you want only people that commit their real identity to evaluating your service

And nor do you get that with an ostensibly non-disposable address either. Almost anyone can sign-up a regular gmail.com address and then dispose of it.

You might be right. It's a decision that should be made by the product owners.

Agreed. Many signups go further and require a "business" address which excludes gmail.com.

And you'll have a little more bad word of mouth.