It is the works of the Ordinals Attack.
What you see here has been the biggest problem with the latest attack, it has succeeded in providing an incentive for regular people to attack the network without knowing it. All out of greed.

They basically created a fake market where scammers create garbage and sell it to newbies who think they can make a profit. Because that garbage (the Ordinals) has a separate value in that market, the newbies don't mind paying a high fee on-chain to transfer that garbage around trading it for possible profits.

This makes things difficult for normal bitcoin users wanting to send bitcoin transactions since a spam attack with incentive to spam is going on.