Sometimes it’s because the company realized that people who are just shopping the price but don’t want to call aren’t the target customer.

Maybe they customize every customer’s pricing. Or maybe it’s a long sales cycle so want you in their funnel from the start so they can stay in touch while working to close the deal.

There’s many reasons to not share a price up front but it is a clue that their solution will be customized somehow and is not focused on being cheap.