"Was it only used by 0.00001% of users, and so wasn't worth the return?"
I think this has merit. Somewhere else in this thread, it's mentioned that this caching process was very old and "unmaintained" so apparently it wasn't used very often (otherwise the process would have been maintained more). But what if it wasn't used much because users didn't know about it or understand what the link did? OTOH, advertisers may have complained that people were using it to block ads.
@IAmDannyBoling @hl @briankrebs long time I don’t use Google cache, but didn’t it allow to see news webpages without registering?