https://arstechnica.com/gadgets/2018/10/drm-for-chargers-google-pixel-3-locks-fast-qi-charging-to-its-own-79-stand/

Google's Pixel 3 smartphone is shipping out to the masses, and people hoping to take advantage of the new Qi wireless charging capabilities have run into a big surprise. For some unexplained reason, Google is locking out third-party Qi chargers from reaching the highest charging speeds on the Pixel 3. Third-party chargers are capped to a pokey 5W charging speed. If you want 10 watts of wireless charging, Google hopes you will invest in its outrageously priced Pixel Stand, which is $79.

Android Police reports that a reader purchased an Anker wireless charger for their Pixel 3, and, after noticing the slow charging speed, this person contacted the company. Anker confirmed that something screwy was going on with Google's charging support, saying "Pixel sets a limitation for third-party charging accessories and we are afraid that even our fast wireless charger can only provide 5W for these 2x devices."