1) Don't engage in businesses that make you a target of the world's best-funded law enforcement agencies.
2) If ignoring lesson 1, don't access servers directly, from home, and don't pay for said servers with personal credit card.
3) Don't pay for your $130K Tesla using BTC a month after you open up a massive illegal drug marketplace that runs exclusively on BTC. Someone may suspect something.
4) When cashing in your ill-gotten gains, don't use your real name.
Seriously, if you're going to do this kind of stuff, paranoia is your friend. "They" probably are, indeed, following you.