Thanks to MTK datasheet leaks (try finding the docs for Qualcomm or even Broadcom stuff...), and the easy rooting (no locked bootloaders), "hackability" is actually quite high. You can also find the source code pretty easily even if it's not officially released --- a lot of these Chinese smartphones are based on the same hardware with only cosmetic differences.

The culture/ecosystem is very different: https://www.bunniestudios.com/blog/?p=4297