Who else is interested?
Google, Microsoft, and Apple aren't known to respect users' privacy. Who we meet, when and for what purpose should often remain in the private sphere.
Other calendars such as from Proton and Nextcloud make that privacy better.
Please, AppSumo/TidyCal consider the growing number of people who are using the ways to "get the privacy back" and provide ways (API) to connect to the alternatives to Google, and Microsoft (even more now (2025), knowing the participation of those companies with Isra*l in the Gaza genocide)