> it doesn't really matter - because 'nah, that's just a fake.'

The point of this sort of thing is that whether it is fake or not doesn't matter. Because it is possible for someone to record a log of your activities, someone claiming they have an incriminating log of your activities will be believed (By a very large number of people).

It might not be believed in a courtroom, but for the other 99.99% of life, we do not apply the same standards for reviewing evidence.

Whether the platform keeps logs isn't important - the platform won't weigh in on this sort of stuff anyways, unless there's a subpoena.