Comment by Aachen

That, but apparently also restrictions on what tech you can use to access the website:

- https://news.ycombinator.com/item?id=44971990 person being blocked with `message looking something like "you failed"`

- https://news.ycombinator.com/item?id=44970290 mentions of other requirements that are allegedly on purpose to block older clients (as browser emulators presumably often would appear to be, because why would they bother implementing newer mechanisms when the web has backwards compatibility)