None of these are conclusive by any means. The IP address check you mentioned would mark anyone using a VPN, or English speakers living abroad. Modern bot detec

None of these are conclusive by any means. The IP address check you mentioned would mark anyone using a VPN, or English speakers living abroad. Modern bot detection combines lots of heuristics like these together, and being able to run JavaScript in the browser (at render-time) adds a lot more data that can be used to make a better prediction.