Personally it never even occurred to me that the "sign up" button would show pricing - in fact it wasn't even apparent that this was a paid product. Usually services have a separate "pricing" link somewhere at the top that explain things.

I pretty much never click on "sign up" buttons unless i have already been convinced the service is something i want to sign up for.

I think of a "sign up" button as something I click after I've chosen to use that product. The button click signals my intent to do so. Having to click it to see pricing is something that would just not happen for me, because I'd never intend to sign up without seeing pricing.

I agree sign-up is not how I would look for pricing. Sign-up is something I click when I'm ready to commit to using but until then I'm looking for information and I expect something like a Pricing page.

If I can't find the pricing I'm never going to click "sign up"

HubSpot popularized collecting emails before providing pricing. A lesson from corporate sales in other industries. (Urgh)

The interesting question is how did you arrive at this site layout where the pricing is hidden in the sign up page when every single SaaS site on the internet has a pricing link in the header and in the footer. Genuinely curious.