Google might require that non-custodial wallets collect the user's email address - and verify that it's a real address. So not full KYC with passport photos and so on. And over time, they might gradually make that stricter

Can you read? The post says they're not. And google already has the email since you need a google account. Its a google email. And what might happen down the road is irrelevant. They might ban all wallets in the future. They might do all kinds of things. But the have nothing to do with this. Besides, how many people who actually care about these things get their wallets from the Playstore or even Aurora?

So it’s ok to require full KYC by these gatekeepers for Custodial wallets like Wallet of Satoshi?

Im not saying its ok. But such is life. and if non-custodial arent affected, why would custodial?