Where does it end? They call out these options as presumably being "safe enough":
- A website on a domain you own - A mailing list - Own and license your Intellectual Property - Sell your merch on your site - Your own reputation
We can extend this logic to an unrealistic degree and do nothing but make your game/app/service completely agnostic to any platform in every way, but we can acknowledge that such perfection is unattainable without throwing out the value of being platform-agnostic in realistic ways.
Is there any data around why these are safer than the alternatives? Because the article is just a classic case of nerd philosophy; there's _no_ justification of the actual risks involves in these platforms aside from vague anecdotes and analogies, then using these vague anecdotes to drive recommendations.
I'm sure there's lots to criticize in "nerd philosophy" but an article that boils down to "avoid vendor lock-in" with a cute analogy is just a weird target to choose. If you can't help but read a certain ideological slant onto it and can't possibly understand it separate from that reading, I think that says more about you.