Is it bad to Derestrict a scooter? Derestricting a scooter makes it faster and therefore more dangerous to ride. Always ride within your limits and be aware that you might need a different drivers license when a scooter exceeds a certain speed or engine capacity. Also your insurance might not cover you anymore.

Is it bad to full throttle a moped?

WOT is bad for the engine. It adds stress and wear. All I can say for this is that running at full throttle is better for the engine than leaving the scooter in the garage. And if the conditions require riding at full throttle to keep up with traffic, it is much safer too.

What does Derestricting a moped do?

Derestricting refers to the idea of eliminating and/or purposely removing restrictions on anything that's restricted. In this case, the 50cc moped comes with a set of restrictions due to CARB regulations in the US.