Your employers are (likely, some assumption here) paying for the productivity of a full time employee. You have figured out that they're satisfied with a third of that productivity.
You are the reason why there are so many return-to-office mandates, because you're projecting the idea that remote employees cannot be trusted. You're making it worse for everyone. Good luck.
Edit, added after the original reply: You are also taking 3 jobs in a market where many people struggle to find one. You are hoarding resources. Enjoy the 3 paychecks, also rot in hell.