Are all 50cc mopeds restricted?

Right so im a little confused. I'm looking to get a ped at 16 but ive seen things saying how they derestricted their 50cc bikes. My question is - Are all 50cc bikes capable of going over 30mph? as wherever I look I see that 50cc bikes are capped at 30mph but then I see a video of a Yamaha 50cc going 50... show more Right so im a little confused.
I'm looking to get a ped at 16 but ive seen things saying how they derestricted their 50cc bikes.

My question is - Are all 50cc bikes capable of going over 30mph? as wherever I look I see that 50cc bikes are capped at 30mph but then I see a video of a Yamaha 50cc going 50 mph

such as these bikes:

Lexmoto echo 50
Aprilia SR 50
Neco GPX
Aprilia SR 50
KYMCO AGILITY 50
Yamaha aerox 50
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