And we all know how things go from there. First, eID is implemented as "just another, more convenient way to log in to your online services". Then, private organizations get pressure to implement eID (through soft power or legislation). Major forums and news websites adopt eID. As the user base grows, legacy semi-anonymous ID systems get decommissioned progressively (i.e. simple email). Now every action you perform on the Internet, and every opinion you post is directly tied to your legal ID. Authorities can use that to prosecute dissenters, oppress voices and narratives contrary to their interests. The bad guys will still have their spaces as they will use their own tech. Call me a conspiracist, cynic or pessimistic, but in some countries like the UK people are getting police visits for having the wrong opinion on Twitter. We're giving authoritarians way too much space and tools for oppression. We're building a shitty world where the powerful class will have even more power to do as they wish, and the man in the street have less and less rights and tools to fight against power.