So the odds of seeing the prompt in the wild aren’t too high unless you’re a Facebook user.
But as more apps show the prompt and it’ll become very common all you need is to agree once and you’ll then be more likely to opt in more than opt out, in my opinion.
I expect that 10k to 10x before the end of the year. Even then, 100k apps out of ~2M isn’t all that many, so it might take a long time for advertisers to regain the kind of access they had pre ATT.