Yes, but in my experience the thrill troll types are frankly too foolish or unmotivated to lie whereas infiltrators can be slowed but hard to outright stop since there may or may not be a financial incentive. Depending the survey type it may be something you can't really lie on readily since it requires a degree of understanding.

Yes this can hinder the lib to left pipeline if you put down a solid theory gate for the general site, just put the more difficult surveys on any sort of sensitive or trolled area, rest can be anything from a few words on some check topic(s) or an introduction (say hi and why with a degree of elaboration maybe some interaction from mods/community), there'd be some community standard maybe a degree of subjectivity, or something like what the chapo discord had years back with a long annoying survey that would take a very long min for a troll to deconstruct.