GeoIP databases: Betfair will use these databases to verify the IP address you're using to connect to the site. If your VPN provider issues you with an IP address that features on a GeoIP database, it will be blacklisted by Betfair, and you won't be able to use it to access the site from another country.
Bots can be setup to bet at a custom time, with custom staking plans and custom trade-out/hedge rules pre-event or in-play. Bots can bet in your own customized way based on your manual selections. Bots can also find selections themselves and be 100% automated based on your selection criteria and betting instructions.