My experience has been that no one can give you as much grief and hostility as a free user. Even charging a buck a month leads to an enormous step up in customer courtesy in my world—I don't know if it applies equally to yours.
So far, this has actually worked out well. Especially for us in an early phase, every feedback and request from a user is very helpful. But that the model works is also proven by tools such as Figma.
Feedback from free users is the wrong feedback. If paying customers ask for a beta of your next feature because they need it so badly, this is feedback. You're talking to people who might leave you once you ask them to pay.