I don't think anyone else has made this observation,
and chances are that the mistake was deliberate,
but the "whats" in the "whats next" of the original post isn't possessive but an abbreviation of "what is" as in "what is next?"
The apostrophe exists to remove confusion and is really easy to understand.
You don't have to do anything you don't want to do, but if you don't learn soomething properly then don't complain when you can't understand it.
If someone has written you a note and they aren't present then an apostrophe can negate the need to ask them what they mean exactly. It removes ambiguity from a sentence or phrase and clarifies the intended meaning of a persons words.