Interesting case. Estonia has lately often been tagged as one of the most crypto-friendly nations in the world. Looks like that wasn't always the case. Probably the root problem was that the government wanted to tax the traders but Otto didn't make it easy for them.
I don't think many countries in Europe are that friendly to startups (perhaps it's the same.for the rest of the world). Removing things like tax audits for their first few years of operation (in innovative markets) does seem like a much better policy as the company would still be finding its feet.
As for financial immigrants, they were present from the creation of the financial system onwards, and crypto isni exeption, with pribably much more undocumented.
This is quite well documented with global companies trying to exempt themselves from regulations and tax too (though it can be done on individual levels - I'd guess there are pitfalls to both).