Right, they choose to do it on top of a Google-run service they don’t pay for. According to you, this shouldn’t be happening.

No, read it again. According to me, many people are unwilling to build a life on sand, it weighs negatively in their choices. The fact that some are observed to take the gamble proves nothing. (And the fact that some of those got nasty surprises of being de-monetized proves that they should have been concerned.)