The unknown browser with 300M users that's breaking your site (opens in new tab)

If features are not supported by software that wasn't designed to include them, that does not make it "broken".

Similarly, if my adblocked browser doesn't serve every desired ad or malware, that doesn't make my browser "broken", either.

I used opera mini when I had a Blackberry, 6-7 years ago. On 3g it was an order of magnitude faster browsing experience than non-compressing alternatives, and it played well on a small screen.