It's not dangerous, and no one will see how many games you have cause by steam you don't have those games. For people to see what games you have, you'd have to actually purchase those games.
If you have a legit steam account (an account with games you bought), never use it with your cracked games... create a separate account for your cracked steam, cause that account will run a risk of being disabled. Although that risk is very minimal, I've never had any of my accounts used with a cracked steam get disabled. This is probably because you will not be communicating with steam servers as much as you would with legit games.
With cracked steam means you can only play on cracked servers unless, of course, you are playing a single player game.
Almost forgot, Welcome to FreeSteam!!