I think you can state this in a different way, "Why would I invest in a company which will be killed by Google changing its mind about an API?" I imagine (but it's pure speculation) that folks like YC, other Angels, or early stage VC's should as their due diligence point out this risk and without a reasonable mitigation option pass on funding.

This would 'self correct' folks who weren't doing the extra work.

However for things where there isn't really a credible way to come up with an alternative you are kind of screwed. But then it would become a Google problem if they didn't get API adoption without offering some sort of indemnification in the event they need to take it back.

I presume the 'translation abuse' is people using it to send spam in 141 different languages.