[ArnoVW]

I think the idea is that the GDPR requires that companies allow users to delete or correct data about them.

And the GDPR scope is determined by the user, not the company. You can have your company based on the far side of the moon, with 99.99% of your users based on mars. For that one user that is living in Europe (note : living, not nationality) the GDPR applies.

Mind you, I'm not sure that the GDPR says that you can't charge for that. As long as you can justify that the amount is in relation to your expenses, my bet would be that a judge will allow it.