Its been a few years but I ran BD for the program in '19-'20 -- I would say that people underestimate the difficulty in shutting down the company if that needs to happen, sometimes getting access to a proper bank account can be annoying, and don't always understand the tax implications (ex. if I was resident in Germany, all my customers were in Germany, but I tried to run everything through this Estonian biz and pay taxes only there, that could very well cause you lots of issues/complications).

Also, shameless plug for people broadly interested in the country of Estonia and how it became a leader in e-gov/tech only a generation after independence from the Soviet Union, I wrote a book about it after being curious myself! https://www.rebootinganation.com/