With the right simulated events, a headless browser becomes indistinguishable from a real browser without platform detection. It's not hard to figure out that these headless browsers are running a software renderer on Linux. In time, they're just going to have to detect Linux users and force them to fill out one or multiple challenges if workarounds like these keep getting used.

The checkbox is just a small part of what the checks are doing. It's monitoring everything the browser is doing and how the browser is responding to certain events up until you tick the checkbox, at which point it determines if you need one of those "are you human" challenges or if you can pass without interruption, based on how bot-like you are.