As long as your notes reach people I wouldn't worry.

I know there are paid relays (like nostr.wine) but I couldn't find any info on the two relays you had errors on either.

It probably has more to do with the relays not allowing just anyone to post through them than your content.

Nostr relay funding/profit model is still to be determined and as the user count ramps up we'll have to see which model (paid/web of trust/etc.) best withstands spam while allowing growth.