Google is a platinum sponsor for Let's Encrypt, which is slowly taking away market share from almost all commercial CAs[1]. They've also removed special treatment for EV certificates on mobile browsers (and are regularly thinking out loud about doing the same for their desktop browser), taking away most of the incentive for using a commercial CA (and not a free DV CA like Let's Encrypt). There's probably also a good chance that they'll offer something like Amazon's ACM (free certificates for various AWS services) as part of their Google Cloud offerings with their newly-acquired roots[2].
I think we can safely say that this would be a very weird way to go about earning a few bucks through CA investments.
