Are there any practical differences between public and premium domains?

All I found was this comment about the difference.

Premium domain is only available when you have premium, because fewer people pay and fewer people use it, so there is less abuse and the domain name has better reputation, so when you public domain is not working, using the premium domain may be able to register.

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Pretty much what it says on the tin. As it’s restricted to paid accounts, there’s less chance of abuse by bad actors on free accounts.

What would such abuse look like?

Bulk signing up for services to take advantage of offers or otherwise break TOS, mainly.