- The company is smaller and/or already geo-distributed and doesn't have the ability (or awareness) to monitor employee locations or deal with the tax/compliance obligations and so turns a blind eye, intentionally or not. The employees are generally operating in a grey area - either on tourist visas or for a company that isn't registered to employee people in their locale.

- The company actively creates a remote-first environment, working with their employees to employ them (compliantly) in their locale, usually through a third-party employer of record. These are very few and far between, but they exist.

- Companies, like Airbnb, that allow for a certain amount of time outside of a "home locale" per year (IIRC, it's 90 days). This isn't truly "global remote" but employees can move around more freely than in-office or locale-only employers.