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Personally I would never use this as I cannot see the pricing on the pricing page.

> Why do people do that? Does it really increase engagement?

It's not for engagement, it's usually because they don't actually have a standard pricing. It signals that they don't want small, self-serve customers, they only want to serve enterprise customers who want to negotiate custom contracts.

In this case, it’s probably because they’re early stage and literally have no idea how to price it and package it.