All of the Chinese OEMs are pretty bad with software support tbh. Here's an overview. Especially cheap phones will get very bad software support. If you want a capable cheap phone with reliable software updates, Samsung is probably your only safe bet right now (and they're not Chinese).
Xiaomi has recently started making some promises for software updates, but only for their flagship devices. None of the Chinese OEMs want to support their cheaper throwaway devices. Also, expect the software of many android OEMs to be riddled with crapware and ads (Samsung, Xiaomi, and Realme are notorious for this). If you want good hardware with clean software and privacy a recent Google Pixel flashed with Graphene OS is probably your only option.
In the end it's still a capitalist enterprise you're "supporting", they all want the most of your money for the least amount of work done on their part.
It's a neat phone, but unfortunately the software support is very bad with Unihertz devices. They don't get regular updates and often run very old Android versions (this phone is running Android 11 which is from 2020).