Then you will get applied tax everywhere, and again you just exchanged paper currency for something you cant "stash for rainy days" and got more tracing coverage on money flow worldwide.

Basically, if we take Steem for example:
To move Steem to real money in Thailand, i need to pay 14% from my earnings, losing additionally on currency value oscialations. If you add tax on it, how much i earn really ?
Conclusion:
In few years everything will be the same, Europe will ended up working for BTC exchanged from EUR/GBP and over tax on it plus fees, we will be paying 40% or more all the fees and taxes to get our BTC earnings.

If you get caught in exchange with wallet full of money gets rigged or dropped, you can forget your future.

So, who to trust ? Cash in the safe. Until BTC/Crypto wallet can be implemented under the skin with life-time warranty and SSL that cover 1M USD damage :)