No, if they can't bike there's always public transportation. If they can't even move in a wheelchair then yeah, I think you'd be trapped anywhere in the world without a caretaker.
So yes, they cycle.
Yes. There are also assistive devices like mobility scooters and canta (enclosed microcars).
And bikeable neighbourhood also tend to be a lot more walkable.
And the netherlands have extensive public transportation networks
> Are they trapped at home?
Much less so than in the US, as they don’t need the ability to drive to get out.
> What about the weather? How is biking in the rain or snow?
As they say in Scandinavia, climate is a clothing concern. Biking in the rain is a habit. It doesn’t snow that much in the Netherlands, but Finns do just fine (NJB has a video on Oulu, Finland, where people cycle year round and there’s 10~20 inches of snow from January to March).
On the upside, I suspect people are in better physical condition.