Why? What is at stake?

Basic decency of being upfront about your business model, and in general being upfront and not being deceitful in life.

Anyways, constructively, they should add a usual pricing page with a nav for that at the top of the landing page.

It makes it clear that something is priced, right on the landing page.

In the pricing page the cards better make the costs super clear.

I'm confused. Datastar is a free open source framework that you can choose to use or not.

It's weird to call them out as indecent and deceitful for not actively marketing features that they really don't think you need. Even when you think you need it, they've actively encouraged people to analyze their problems to identify if it's a real need or a gap in hypermedia fundamentals knowledge.

Also, the top nav has a Pro page that has what you're looking for.

”Ready for liftoff?” should have a go-pro button. That’s all that is needed.

Why have a call-to-action to something they don't want you to do?

It's only there for Pro users and people who want to support the project [1] and not normal use.

[1] https://data-star.dev/essays/greedy_developer