@Blackheart I'm going to ignore your other points, some of which are completely frivolous and irrelevant, and respond to the most serious point you raised:
Does Magnus Carlsen have to beat up 2500 rated players in 10 different tourneys so he is allowed to defend his title?
I don't know why you're asking this rhetorical question like some kind of gotcha, because the answer is yes. Magnus Carlsen does. Magnus Carlsen beats up 2500 rated players on a regular basis to defend his title. If you count online titles, he definitely plays in more than 10 tournies a year. In 2020 alone, between FIDE Online Steinitz Memorial, Lindores Abbey Challenge, Clutch International, Chessable Masters, the various Banter Blitz's, Legends of Chess, Norway Chess, Magnus Carlsen Chess Tour & associated Finals, St. Louis Rapid & Blitz, Skilling Open, Tata Steel Masters, and Airthing Open Masters, Magnus Carlsen has played more than 400 official tournament games, winning most of them. Why is Magnus doing this, when he could be super cool, not play anything, and just show up for the biggest tournaments? Most of the top chess tournaments invite the top active players, right?
Right. They invite the top active players. Magnus is beating up 2500 rated players on a regular basis because, if you stop playing chess and achieving tournaments results, you are retired. Do you know what happens to retired chess GMs? They don't get invited to chess tournaments. Gary Kasparov would not automatically get invited to Group A of the next Tata Steel Chess Tournament, even though he had once held the highest rating in the world and won that particular tournament 3 years consecutively. If you look at FIDE ratings here (https://ratings.fide.com/), you will notice a distinct lack of retired top players like Kasparov. Would Kasparov, with some secret preparation with his also-retired GM buddy, be able to beat the other active GMs at Wijk aan Zee if he just showed up there? I don't think it's impossible. Perhaps even likely, depending on the amount of preparation he committed to doing. However, could he just show up, claim that he has "been a top5 player for literally" decades, despite having not played any serious tournaments recently, and expect to compete against them?