Today I stumbled upon two different (now deleted) questions. The format of the two questions was very similar: a question on measure theory (more specifically, on the exchangeability of a sum and a integral basically), introduced by the same paragraph, which went something like : Hello! I have been studying math on my own and I stumbled upon this problem in "Introduction to Manifolds" by Loring W. Tu.
In both situations it was clear the problem did not come from Tu's book (which does not introduce Lebesgue measure only the concept of "zero measure" sets). When I pointed this out in the comments to the question, both were promptly removed from the website.
EDIT: I found another question like these, presenting the same problem, this time without the fake origin
I also think I spotted another question of the same kind: note that, as the others, it begins with "I've been trying" ... and presents a problem using Lebesgue measure while the book it is supposedly from does not present anything remotely related (e.g., "odern Network Interdiction Problems and Algorithms" never uses the terms "compact" or "Lebesgue" and it seems to me to be on a totally different topic)
I am making this question on meta mainly to point this out and to see if anyone has a reasonable explanation for this