The free pack is exactly what it says. A small set of sounds, free, sent by email. No trial, no upsell three days later, no drip campaign pretending to be a friendship.
What You Get
A working starting point. Enough to build something with, chosen because they are the sounds that get reached for most often rather than the ones that demo best.
What It Is Not
It is not a complete library and it is not going to make a track for you. Nothing will. If a pack promises that, it is selling you the feeling of progress instead of the thing itself.
It is also not a hostage situation. Take the pack, never open another email, that is fine. The point is that the sounds are out there being used.