I am 100% for users to obfuscate. I am 100% against miners using it. Having said that TOR mining wouldn't be desirable for commercial mining anyway. Centralized open competitive mining is optimum for consumer protection and global participation.
It provokes the honest question of: How exposed would you want mining to be?
Should they all register with their local military authority?
Or put another way: Is it necessarily a "business" and subject to MTL?
I don't care if miners obfuscate, I just think they won't. When mining becomes institutionalized and owned by VISA/Master Card they will want to brand their mining service with low fees and zero confirmation guarantee. It also behooves miners to be open to prove they are not double-spending.