It's probably worth discussing the reasoning behind a statement like this. I don't pay attention to low-end Android phones - maybe they really do this to you. But it seems really unlikely.

Do you have examples?

I know many people complain about battery degradation. But really, these phones are using about the most advanced batteries that are available in the relevant price range. They are degrading because you are using the device a lot. You really are. Are there any credible claims that batteries are degrading faster than "normal" given usage patterns?