A public library lets a person stay without continually proving they can buy something.

Almost every warm indoor space in a town is conditional on spending. You can sit in the café for as long as the cup lasts, and after that there is a slow pressure to order again or leave, which is not hostility so much as the arrangement working as designed. A place with no such test is unusual, and it matters most to the people who have the least: those between homes, between jobs, or simply cold. Access without a transaction is the whole point rather than a side effect.

Use yours. Join, borrow something, and notice who else is there and what the building is doing for them.