FYI, in Widevine's latest Quarterly Update newsletter of June 2025 --- that I receive because I enrolled to the Certified Widevine Implementation Partner (CWIP) program --- I can read this :
Desktop Browser Update
The desktop browser CDM will be removing license persistence capability. It will only support a streaming license, not an offline license.
This capability will be removed starting with the Chrome desktop browser M140 release due on September 2, 2025.
Idk how this can impact Chromium, and possibly Electron-based apps ? I have asked the same in the CWIP mailing list...