The heavily advertised (i.e. funded) flat earth psyop is (obviously and by definition) a psyop.
The primary purpose of that psyop is to stop people from earnestly researching or discussing the subject because of how valuable it is.
It does this a variety of ways
Portraying "flat earthers" (nomenclature and visage both products of the psyop) as impossibly/unrealistically stupid. You are meant to believe that people this stupid aren't worth considering, and therefore anything they say is to always be ignored.
Loudly advertising demonstrably false claims. This supports #1 but also convinces some earnest wayward researchers to pick them up and repeat them. It's a method of "seeding strawmen". In the frightfully simplistic mind of the "debunker" and audience - 1 wrong claim = all wrong claims.
Encouraging (false) antagonism and enmity between a false dichotomy of "globers" vs "flerfers" (childish and inherently stupid derogatories like this are also products of the psyop). As long as they are enemies and squabling like children - they can't collaborate or effectively share knowledge / communicate.
The heavily advertised (i.e. funded) flat earth psyop is (obviously and by definition) a psyop.
The primary purpose of that psyop is to stop people from earnestly researching or discussing the subject because of how valuable it is.
It does this a variety of ways