I usually use Chinese knockoffs. Brands like Cameron Sino and Nohon are growing brands who accurately state capacity, make good batteries, and don't pretend to be OEMs.

As for official batteries, California's Right to Repair law compels manufacturers to sell parts like batteries for as long as they sell battery replacement services, up to 7 years. Apple still replaces batteries for the iPhone 5S, a 10-year-old phone, so they 2022+ phones should have official batteries available for a long while (and the prices seem quite fair). Google also sells genuine batteries for the Pixel 2, a 6-year-old phone, through iFixit. Samsung only offers batteries attached to a midframe and display assembly, for the S20 and newer, through iFixit for $200+. So the former 2 brands seem like good options.