> i suspect they can detect that in a similar way to capchas and "verify you're human by clicking the box".

I'm not so sure. IIRC, capchas are pretty much a solved problem, if you don't mind the cost of a little bit of human interaction (e.g. your interface pops up a captcha solver box when necessary, and is solved either by the bot's operator or some professional captcha-solver in a low-wage country).

there are services that solve captchas automatically with above-human success rates