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"Don't depend on "free" for critical functions."

Yet that is exactly what so-called "tech" companies enable, and arguably encourage, millions of people to do. They certainly do not discourage people from using their websites and apps, for any purpose, from what I have seen. That would make no sense. Imagine Google showing a warning along the lines of "Do not use Gmail for important purposes." Instead the message might be "Here is something to enhance security". These companies have conflicts of interest vis-a-vis computer users. It's like an opioids company tasked with preventing addiction. The best they can do is promote treatment of addiction. This is a poor analogy because selling drugs is regulated. Handing out free email accounts, in order to conduct commercial surveillance, is not.