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I mean, why do you care if it's a sustainable business practice or whatever? Unless you're a stake holder or something then how much money they're missing out on shouldn't even be your concern.
If I'm making an account and potentially moving to a whole new SaaS ecosystem, I might wanna know if what's going on.
Imagine moving to a new email address, informing every single person about your new email, and then the company goes under. Or starts displaying ads. Etc., etc.
There's no guarantee a paid service won't go under either, though.
Not moving is easier than moving.