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).