Google is getting away with this behavior because of their monopolistic behavior. If they had competition, they would be spending billions on customer support, but because they have a monopoly, they can get away with having virtually none. This is their way of saving money and taking advantage of their monopoly. It's a shadow version of monopolistic behavior where the absence of services can be done because we have no choice. We need to politicize this issue.
Facebook is exactly the same way.
When a company reaches such dominance, and when people completely rely on a company like we all rely on Google, Facebook, et al., then we need regulations to prevent what is happening right now, which is using their monopoly to make life easier for them by not spending any money on customer support.
Would you prefer government change this balance by regulation, or let users decide what they want?
Many users choose very cheap typical service with a small but real risk of misery. Perhaps it's because they don't understand how miserable it can get. It's important that the bad experiences see public light so people's choices are informed.
They provide products like gmail for free because it allows them insight into people's communication which they can then leverage with search and ad networking to make way more than they could simply selling email services.
But let's not lose sight of the fact this is one of the biggest companies in the world we are talking about. A company that could probably treat the entire GDP of a small country as a rounding error.
That margin you're referring to is very likely enormous and even if it cost them 10% of said margin to offer better service for it, they would still be making absurd amounts of money.