

Yeah, but you can do this in the background without blocking the whole page. In fact you have to go to extra lengths to make it “block” the whole page. Maybe it’s just some css that sets the cursor to the “loading” image, and then ignores mouse clicks for a while, giving the illusion of doing lots of work…
Might be hacked accounts. The same happens on facebook. Some friend had their account stolen, and could not get it back. Half a year later the name and profile picture changes to “Elon Musk”. Reported it to facebook for Scam and “Impersonating public figure”. They have a report category for this exact case, so surely they know that this is a problem and they will take care of it, right? Nope, according to Facebook everything is A-Ok with the account, and no action is taken.