My Pixel 4a had immediate fast battery-charge loss after the Google upgrade. Google determined that my phone was affected, and offered 3 choices: free battery replacement (but you must pay for other phone damage, and now thanks to Steve here we know how that's working), $50 refund, or $100 toward a new phone from the Google store. I chose the $50. BIG MISTAKE. They don't tell you this until after you make your choice, but the $50 refund is only made via Payoneer, which you have to sign up for. Payoneer has an annual fee, and though you can cancel it after you get your $ to avoid that fee, Payoneer then has some very sensitive information about you. I started to sign up for Payoneer, but didn't feel right about all the information they required, and backed out. I have no other options - Google said once I made my choice there was no going back (I thought I would just take the $100 off a new Google phone, but they said it's not possible after I made my initial choice).
I really feel that Google should have told people about the Payoneer bit BEFORE you are asked to make a choice. I had been happy with my Pixel until Google messed it up. Because of the way they have treated me in this situation that they caused, I guess I will be buying another phone and it certainly won't be a Google phone!