It is hard enough to find your own really old posts again because of changing relays from the old days and most social is "now" focused anyway that I'm not sure if I care my posts are saved for very long.
Setting up a site on npub.pro seems to be an easy way to collate your own posts. So this may be a partial hindrance to the freemium model for relays.
Npub.pro doesn't store your posts, it just pulls them from relays, so if you don't have a relay that stores your post for long-term, the npub.pro won't help.
Thanks for this clarification.