My tiny allround VPS at Hetzner has a sort-of fail2ban, mainly to prevent the logs from filling up with garbage that won't work anyway. The ban-list usually had around 120 entries of repeat offenders. Starting this year the list had grown to a constant 200+ entries, and this morning it's at 380. I don't have any statistics, but my guess would be the machine sees more abuse attempts than actual traffic. Do you notice a similar trend?