So far I haven't been KYCd by anything.

Aside from YouTube I don't particularly engage with any of these often, but my Google, Facebook, Discord, Twitter, Bluesky, (current) Reddit, Slack, Telegram accounts all seem to be BAU without new requirements.

If the 80% of us currently holding unambiguously-over-16 accounts are exempt, and it only affects future over-16 users as they're onboarded, then it is a very blunt and very slow form of data harvesting which won't yield useful results until years/decades after all of the relevant decision-makers have moved on, retired and/or died. So this seems unlikely?