It’s up to the developer to share their stats if they choose, that is private information by default!
Viewing post in Add a feature to show number of downloads
Then, why not add an option for developers to show their app's download stats? . For example, when one is showcasing his app product in a seminar, we don't only want to show screenshots. We'd like people to be able to verify and see it themselves on the accessible platform. Itch.io easily provides a valid and valuable metric to our apps since it is considered a 3rd party platform like Steam, Android or IOS app stores. I don't see why not have an optional feature for this! It'll possibly make Itch.io a more popular platform for developers to publish their stuff, at least I would as an indie developer! Itch.io just feels right to publish indie games!