> Legit assuming that everything is as simple as it can be, that the most obvious idea to occur to any untrained observer is the most accurate, is literally a guaranteed way to go though life without understanding anything, at all.

That's a misunderstanding of Occam's razor. Occam's razor says that if you don't know the answer then when you have a choice between competing explanations, pick the one that requires fewer assumptions.

The explanation that they are using incorrect grammar on purpose to screen out intelligent people is logically questionable, unproven by any evidence, and relies on a bunch of assumptions: sophistication, time is worth more than leads, good enough education and experience in English to write it well, and coordination between scammers.

The 'being bad at speaking a language or dialect they are not native in and having poor access to education' explanation is logically complete and requires far fewer assumptions.