When playing on community servers I never witnessed aim bots until now.

• Uncletopia servers are okay...
• there are funny inofficial game modes like:
  • x1000 multiplies all weapon stats by 1000
  • classwars one team is one class. for example medics vs scouts
  • randomizer, get a random weapon (for example Medigun as heavy)
  • jump training maps: solve pakours
  • grappling hooks on ctf (community maps like ctf orange)
  • 100 players in one server

So: Community servers should be used more often by normal players, they offer diverse different maps and gamemodes and are a decentralized solution to the bot problem.