[tosh]

I think in most cases “failed” just means the founders think there are other (clearer) opportunities to pursue. Doesn’t necessarily mean what they were working on didn’t make sense.

IMHO there still is quite an opportunity to find substitutes for ads that provide revenue for websites and aren’t as annoying as ads whether it is mining or something like SETI or something like re-captcha.

Would love to see more in this direction.