If you don't use a VPN/proxy, they can tell all of your traffic is from the same area. If you use a VPN/proxy, they can tell all of your traffic is from a VPN/proxy. Either way, it looks suspicious. It might've worked 10-15 years ago, but algorithms and data tracking can find fingerprints that you don't even know exist.
Edit: I'll add a bit more to this. If your conversion rate is near 100%, it's another red flag. There was an old-school method of sending a bunch of fake traffic to the offer to lower the conversion rate, but that is also easily detectable these days.