3. Hosting websites with DDNS (though the abuse from that caused Mullvad and IVPN to drop port forwarding)
4. Though it hurts anonymity, and is relatively rare: I2P or Hyphanet, because some websites block known P2P nodes[1]. Important if your bank or work is being a jerk about it.
5. As ThatMedicIsASpy notes, ISP issues: some routers soil the bed from P2P, some ISP's throttle P2P traffic regardless of legality, etc.
4. Though it hurts anonymity, and is relatively rare: I2P or Hyphanet, because some websites block known P2P nodes[1]. Important if your bank or work is being a jerk about it.
5. As ThatMedicIsASpy notes, ISP issues: some routers soil the bed from P2P, some ISP's throttle P2P traffic regardless of legality, etc.
[1] https://old.reddit.com/r/i2p/comments/tc3bhs/is_anybody_else...