I commend you on the approach and this is something I was very much looking forward to. However there are a couple of constraints that will prevent me (and I think other people) to apply:

- need to visit Estonia to open a bank account

- filing taxes with an accounting software in Estonian only

Solve those 2 issues and the only one left is the unavoidable double taxation complexity: you could try adding more information to the site about this subject, for example stating with which countries Estonia has currently established treaties to avoid double taxation.