[Goronmon]

In fairness, there’s also the misguided assumption that services cost nothing to host and ad revenue cannot possibly offset the costs.

No see, you can't bring that up because they already called that reason "tiring". Thus it is invalid now and you need to come up with a different one.

[toastercat]

Disregarding your sarcasm, I did not call it tiring, and I've also never seen anyone make that misguided assumption.

[the_sleaze9]

4. Without ads, YouTube cannot exist

In my view, you did call it tiring and were thereby stating that you had seen someone make that assumption.

[toastercat]

Saying "without ads, YouTube cannot exist" is not the same thing as saying "services cost nothing to host" at least in my view.