Apple sells some ads yes. But it’s a tiny fraction of their revenue.
Would Google or Meta go bankrupt if they stopped selling ads? Yes. Apple wouldn’t.
Apple would go bankrupt without US protectionist policy propping up their service revenue.
That's pretty bad. Maybe not "reliant on ad monopoly" bad, but pretty close.
What does whether they’d go bankrupt or not have to do with whether they’re an ad company?
They sell third party ads: companies unaffiliated with Apple pay Apple to advertise on Apple platforms.
They’re an ad company. Just because it’s currently a small slice of their total revenue doesn’t make it untrue.
As long as you don’t count the $25 billion that Apple gets from Google.