some of them are, some of them are not

you can try and reach the relay operators to ask

but it's not a problem for visibility rly, i think most only delete after a certain period.. months i assume

you have your own data backed up w your relay is what counts

shouldn't be a problem for visibility

you should def not upload media with the nip95 verified thing tho, you'll reach only amethysts users with that and there's a lot of damus users here too