I'm too wily to buy something like that. But if I did buy one of those things, and an advertisement appeared on it, my reaction would be "how dare you put advertisements on my fridge which I paid money for! I'm not buying anything from your company now unless there's absolutely no alternative!"
Advertising-supported free services? Fair enough, I understand the bargain there. Showing advertisements on something that's paid for? You are now my enemy.
They're fine against conventional attacks, I don't know where you're getting that idea from. It's true that one finalist turned out to have a catastrophic flaw, that doesn't mean they're generally worthless. What it actually means is that we have less confidence in their primitives than we do in conventional primitives, since they haven't been around for nearly as long. Whether you think the increased risk of a break being found is more or less than the risk of someone attacking your conventional algorithms with a quantum computer is a judgement call.
However, you don't have to make this judgement call. You can use hybrid algorithms - sign/encrypt with both conventional and quantum-resistant algorithms. Then in order to break your crypto, an adversary needs both a good quantum computer and a PQ algorithm break.Or for signing, you can use SLH-DSA, for which the only primitive is well-tested hashes, providing its slowness and large signatures don't make it impractical for you.
"More software projects have gone awry for lack of calendar time than for all other causes combined." -- Fred Brooks, Jr., _The Mythical Man Month_