What is the advantage of paid domains, from free ones?

Question

Domain name market

In principle, I know the pros superficially, but I need the most detailed information.

Answer 1

Free is as easy to lose as it is to gain. The registrar has the right to pick it up at any time

Answer 2

free domain - yours only temporarily

Answer 3

Free, upon reaching a certain attendance, they will squeeze out (there was experience with .tk). And in general, the contamination with doorways / viruses is higher than in the paid zone.