> In one of the tests rav1e encoded 1080p source at 0.013fps (i5-7600K @5GHz). That's half a year for a 2 hour movie

This is easily explained by 1) no hardware acceleration, and 2) the reference implementation is currently intended for clarity and ease of changing, not efficiency or speed. After the bitstream solidifies, both problems will be solved.

> Private torrent communities are already reluctant to use x265 which provides marginal gains compared to x264 at a great increase in encoding time

Because there would be a clear quality loss. The websites they're ripping from (amazon, netflix, whatever) are using H.264, and to recode into H.265 would lose significant quality.