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Lots of people have succeeded. Neither Anthropic nor OpenAI has any technical advantage in the field of subscription engineering.

Please give me a few examples of people succeeding with the technique.

Specifically, examples of people later exploiting their monopoly to charge people more than they otherwise would have paid.

Ubers have become pretty expensive these days.

Well, is Uber a monopoly and collecting monopoly rents?

I use Lyft because my phone is too old to run the Uber app. This says nothing about market share obviously.

Amazon and diapers.

Could you elaborate a bit? I'm not aware Amazon has a monopoly on retail, nor even online-shopping? Could you explain what you mean with the diapers?