Only fully decentralised software and networks will keep you anonymous anything that passes through somebodies server can be hacked or taken out.
This the main risk with Tor is in the exit node where the information comes out
Inside its clear more or less
In a July 30 blog post, Tor confirmed that several entry nodes may have been run by a nefarious party attempting to identify Tor users, and they appear to have been successful.
That said it makes sense that some malicious entity would control the node to try and access data its a problem that needs to be solved.
Although some of the proposals some altcoins have to address it could be applied to this and make things more interesting.