The part where it says they are about to start taking your money?
Someone appears, gives you a service unprompted(carries your bag of spams some AI code reviews), them later demands payment.
It's not a small print somewhere, or one of these weekly app store subscriptions that run up high bills because someone clicked "Yes" in a game.
It's like calling a Netflix renewal email a "shakedown" just because they send you an email giving you a heads up that your trial will convert into a paid subscription.
And yeah, that how the businesses work: you opt-in to feature, then you start paying for it. Sometimes the latter part is delayed, in which case it's a good style to send heads-up email about it. Nothing unusual or scammy about it.