It's why these enterprise vendors want foot in the door at all costs.

They know that if they get entrenched first, it's impossible to migrate away. That's basically free money from a customer that has zero cost ceiling.

That's false that Government agencies have 0 cost ceiling. Maybe DoD does, but most offices have extremely tight budgets.

As far as I know numbers aren't reported, but there's probably at least as many DIB GCC-H customers as government, who in part use it because the government does and it's compliant. Once they're locked in it's very hard to migrate.