Because the speculative version is much less trustworthy - and because this kind of service is prone to data lock-in, trust in pricing/profit-models is particularly important.

Consider this: for an existing service with lots of data to back up its pricing, a price list can be treated as an effective guarantee of what the service will continue to cost into the long-term. The company knows that the pricing model is profitable - and therefore, raising prices won't be worth the massive customer outcry.

For a new company, a price list is speculative. There is no way to do accurate long-term extrapolation of profitability. If the prices turn out to be too low to sustain the business, they will have to be raised - and while there will be an outcry, the business will simply have no alternative.

And since it's really hard to migrate all your data/workflows/integrations/etc. away from the service you first decide on, you're incentivised to never join a new service - because the price instability might come back to bite you, let alone if the company itself doesn't collapse later.

> This is such a nothing statement

Nope

> How is that different from setting a price list on their website? They hope people will pay them doesn't mean they will

Agree; I would make the same comment if someone claimed a price list meant a business was stable and worth relying on.