They can try to block crawlers all they want
They will not succeed without restricting access to Reddit to an unusable degree, since crawlers can be coded to imitate real users close enough. Combine that with enough proxies and they can’t do jack shit
Also you could get arround the Referer header quite easily via redirects (unless Reddit went ahead and used a Whitelist for those, which again would be a very stupid decision) and some more methods
Afaik, it wasn’t broken. The Roblox devs put in extra work to block Linux users from playing because according to them “the majority of cheaters are on Linux”. Who knows if that’s true