Most of the processes surrounding and supporting science are not robust against a dedicated adversary seeking to exploit the system. This is nothing new - Newton ordered and then wrote the anonymous report commissioned by (iirc) the Royal Society to decide who invented calculus, him or Leibniz.
Basically, science is quite vulnerable to malicious exploiters. Part of this is because society isn't funding science anywhere near sufficiently to do a priori in-depth checks. You claim you got data on hundreds of measurable thingies in a certain way (from surveying people to scanning the web to whatever)? If it's not blatantly obviously a lie, it'll probably be accepted. Which is inevitable: at one point, you're going to have to accept the data as genuine. If there's no obvious red flags, you'd only waste time on further checking data - you'd need to do a real deep dive (expensive time-wise) to come up with circumstantial evidence that may still be explainable in a benign manner. For scientists, it is almost always more profitable to spend such time investments on furthering their own scientific efforts.
So yes, there are various ways in which someone willing, dedicated and sufficiently skilled can "Nigerian-Prince" the scientific process. Thankfully, the skill to do so typically requires intimate knowledge of the scientific process and how to conduct research -- this cheating is not easily accessible to outside bullshitters (yet).