Yeah, so for Bedrock it is hosted by Microsoft and they are responsible. For any hosting infrastructure they will need to manage things themselves, but Microsoft seems to be taking things a step further. They seem to have blocked chat for Java users who are not verified to be adults. This means you may have to use a third party provider to verify your account by providing them with various details and trust that they won't sell that information on.
Honestly, it is not something required by the law and it fits with a pattern I have noticed over the last few years. VPNs are being banned, age verification is being required on more and more sites starting with porn but now moving to things like video games, and the third party companies who can verify your age seem to be able to either sell that data on or sell things derived from that data. If I were planning to use authoritarian methods to control a population, similar to what ICE is doing in the USA, I would choose this strategy. Given the information in an age verification check I can train my AI systems to recognise specific faces and link them to the IMSI from a mobile phone present at a protest. This would identify the protestors and allow retribution at scale. Is that what is happening? I don't know. But does it look exactly how that would look? Yes.
This is a legitimate concern and has been addressed to some degree in some areas. Unfortunately we don't have a perfect way of knowing that a specific specimen is from a specific species. Two very similar skeletons could be from the same or closely related species. The same goes for development over the life history of a specific organism. Adult humans have a different skull to height ratio to babies, but the ratio between toddlers and young chimps is very similar.
Fortunately we have many different aged animals of the same species in the same context to compare. We can see the infant, child, adolescent, adult, and aged forms for many species and this acts similarly to transitional fossils, they help close the gap. We can be more sure with more hints like sharing a space, being buried in the same context, having the same nitrogen isotope ratios in teeth, and eating the same prey. Lots of other things can act as clues to the relationships and make us more or less certain of a given relationship.
That said, fossilisation is rare. Not all that many individuals will be fossilised. Different types of tissue fossilise to different degrees and in some cases not at all. If an animal is mostly spongy material they may degrade too fast to fossilise and preserve structure. Other examples may only leave their imprint as a hollow or pressing of one material into another. I think the record is very sparse and will remain so, but adding more example allows more connection and conclusions to be made.