Elon is always obsessed with WeChat’s model. (For those who don’t know about WeChat, it is basically the name of the ‘Everything app’.)
Everything in one single point is pretty convenient but has led to a bunch of risks…
Leave a risk that you know in the comment.
Also, websites can and do look for all kinds of patterns to identify you. Cookies are so old news that Google is actively working on ditching them. Way more sophisticated methods by now to identify you without a direct tracker.