As a German, afaik if you want to permanently move to germany you need to prove that you can support yourself financially (or someone else will?), so you will need a job offer and or some savings.
There is no requirement to not be disabled, but being disabled could make fulfilling those requirements more difficult.
They also allow you to plug in a grounded Schuko Plug (Its the german one) without connecting the earth, cant get much more dangerous than that. I think the french plug also can be plugged in but it doesnt connect the earth either.
Here in Germany some McDonalds and Burger King do have self serve drink machines with unlimited drinks, but they are not that many (I would guess 10-20%). Some other fast food chains are more likely to have them, like Subway.
That is mostly there for another reason, to distinguish between different voltages.
When a connector is meant for a different voltage the Earth connector (which is thicker than the rest) gets moved along the circle so it would be impossible to plug it into one with a different voltage. The nub stops you from just turning the plug to make it fit.
Greetings from Germany from someone who has used these quite a few times, mostly 16A and 32A variants and has never seen a locking one.
It would be a kinda fun league to watch, but I dont want to hear about athletes dying because they took obscene amounts of steroids to be the best.