Here is a better article about this change: https://www.dcrainmaker.com/2024/11/stravas-changes-to-kill-off-apps.html

Here is the precise line that sucks: “You may not process or disclose Strava Data, even publicly viewable Strava Data, including in an aggregated or de-identified manner, for the purposes of, including but not limited to, analytics, analyses, customer insights generation, and products or services improvements. Strava Data may not be combined with other customer data, for these or any other purposes."