It's standard "Capital Gains Tax" rather than "Income Tax" when you take it out, just like it would if you sold forex/pm or stocks for that matter.
All governments keep an eye on unusual inflows from accounts on that one, no i wouldn't recommend to cheat on that one.
Yes, of course. When I grow up more and find a stably job. I can pau taxes too. Especially now, we pay taxes even though that we are students. That taxe called Value Added Tax.