It certainly raises an interesting question. The go-to response when anybody discusses brute forcing bitcoin is that the sheer number of possibilities makes finding a collision infinitesimally small. And that's true. Same for .onion certificates.

But Google certainly haven't been attacking this for the last 6,500 years. With a sufficiently obscene amount of resources, it IS feasible to create an index of every possible public/private keypair. It's not profitable to do so just for the purpose of plundering bitcoin wallets, but if you're a government doing it for other reasons, it might be worthwhile.