There are plenty of hobbies where you can happily enjoy it and only ever spend little if anything.

On the other hand, I've found it's pretty uncommon to find a hobby where you can't optionally fall down an expensive rabbit-hole of some kind, usually around any kind of equipment or tools you might need as part of some hobby.

Thankfully for most hobbies that kind of thing is not required to enjoy it. You don't need a fancy guitar to enjoy playing; you can read books from the library, you don't need to collect your own; in most big enough cities (in Europe at least) you don't even need to own a bike to go for a cycle (though regularly using bike rental schemes might be a sign to try and get a bike, doesn't need to be fancy)