In my opinion paid relays are not the answer but to educate the public in general that owning your data, self hosting and adding your own relays with redundancy is the optimal path.

Not your relay, not your data

Private relays will add not only filters for adds (which most high end WiFi routers and paid VPN services add already) but they can implemented as well censorship, filter means they decide what you see and what not.... So another Twitter in the making...

You can backup your private relay data as well, so data losses would be a matter of proper backup discipline and efficient implementation of cron

Unless I am missing something , please let me know, because it seems quite unappealing to me