I don't know what it is, but I've seen more and more moon hoax and flat earth stuff on the Internet today than I recall in the past. Perhaps it's observation bias, but it seems like it's more prevalent today than ever before.
That's because those crackers are finally learning how to use the Internet.
Apparently some famous rapper went public with his Flat Earth beliefs recently:
I think it is unfair to compare moon hoax theories (which intuitively make sense) to flat-earth theories (which can be intuitively disproven by anyone taking a flight on an airplane).
For some it's a "protest belief." Few really believe Apollo was a hoax, but many more say so as a way of saying f u to the near cancellation of the space program and the general direction away from visionary things the country took since then.
Do you have any evidence to support this theory? Certainly seems like the deniers believe it for real.
I was personally told this once, and I also extrapolate it a bit from insight into the differences that often exist between actual and stated beliefs and how the latter serve more for social signaling. I generally find literalist interpretations of belief shallow.