I don't know, but I also don't think you should. They are one of the few reasonably ethical platforms so unless you truly can't afford it or have an ethical reason I don't know of I would pay. They do occasionally promote proprietary software but are still far more ethical than any other platform.
Like yeah, sure, LTT makes (at the bare minimum, the actual # is more this is just extrapolated from their lowest sub cost) like 1.5mil/yr from Floatplane (gross, ofc, not net). That's a pretty modest amount for their team to include profits/salaries/hosting/etc.
Linus Sebastian, the individual, is a millionaire. That isn't money that is being used to make my quality of life/other services worse, though. I don't care enough about the exclusives to actually watch them, but if I did I'd fork out $3-5 every few months to catch up on the ones I wanted to see.
Big tech? Raise ye flags. Normal people making a living off of big tech? Feels weird to me. Not saying not to hurt their bottom line, just that doing it through a platform that (at their scale) isn't making a ludicrous amount of profit and isn't actively damaging your access to your services, feels weird to me.
Just pirate YouTube. It will give you the same content for free, and you'll be stealing features Google thinks you should be paying for, like background playback, video quality, a down vote count, the ability to download videos for later, etc.