I've always disliked this strategy. It doesn't feel good to start off your relationship with a customer with deception.
The landing page should say: "We are building this product, but it's in the early stages. Leave us your email if you're interested to learn about its progress and availability before your competitors do. Early adopters will get discounts / free plans."
If this page gains any traction, subscriptions, interest expressed via the "Contact us" page, then the product is likely worth building past the feature list and a general idea of the architecture. You better have a prototype that will allow you to quickly demo some of your key promised features.
> It should not be deception.
> The landing page should say: "We are building this product, but it's in the early stages.
But you aren't building that product. You're considering building that product.
IOW, it's still deception.
If you have a proof of concept, have put in some thinking, made UI sketches and flows, etc, you have started building the product, because you can't advance further without that. But you have to find out if it's worth putting more effort and money into it.
Cleverly worded gotcha deception, sure. But deception none the less.
I think that that bar is too low to move from "we're considering building $FOO" to "we're building $FOO".
I mean, with the bar for "we're building $FOO" being "Investigate demand for $FOO", then the phrase "we're building $FOO" loses all meaning.
It's the difference between "we're getting divorced" vs "we're considering divorce".
"we're starting a new job" vs "we're looking for a new job"
"we're building a LEGO deathstar" vs "we're buying a box of LEGO"
I see no reason that "we're determining whether to build $FOO" is the same as "we're building $FOO"
If you include this then you're not even validating to the extent that you think you are. Because you're validating that people will sign up to use it for a discount / free, which doesn't necessarily mean anyone will pay full price for it.
People building AI-powered things are doing this a lot: add AI and clearly the product will now do <thing it's not clear you can actually deliver value on>.