At some point the Silicon Valley excuse of "we can't afford to do it" is going to run into dumb but powerful regulators who simply do not care and who will impose strict law to force it to happen.
YouTube has managed to persuade some regulators that the advertisers and the channel owners are solely responsible for ad placement, and that YouTube (which controls which products can be advertised, which places the ads, which takes most of the money for the ads, which has contracts with the advertisers and the channels where ads are placed, which earns most of its revenue through ads) has nothing to do with ads. That's worked for them in the US, but it's a fact that regulators in other countries are losing patience.
For example, YouTube needs a way to stop alcohol being advertised to children.
At the moment YouTube are saying that it's the responsibility of the drinks company and the channel to stop this happening. That works in the US, but it doesn't work in Europe, and YouTube saying "we don't know how old people are because COPPA" is met with "so what? It's still a problem, and you need to fix it".