I was using .ml domains for my selfhosted services, since it was just an hobby and I didn't wanted to invest money on it. Apart from Freenom website being pretty unusable since I have memory, I've already had troubles renewing them last year and now they stopped working without any notice nor update from Freenom itself. Finally I decided to move to a payed domain from Infomaniak, since it's been more than a year I've been selfhosting and $10/year is a fair price for me.
But still without those free domains I wouldn't probably ever started selfhosting, and I guess a lot of other people like me wouldn't have experimented or spin up their projects if they had to pay for a domain from the beginning. So despite my hate for Freenom I guess I have to thank them and hope someone else (maybe a bit more "professional") will take its place in the future