There is also PbtA game called The Veil which has rather nice not-setting, that is a setting frame where there are a few facts which are set and the rest of the setting you create during session 1. It could support Shadowrun esque setting even with the fantasy heritages if one would so wish. Only facts that must be there for the system is that the setting is cyberpunk, has a virtual reality layer upon the world (the titular Veil) and that society has a strong reliance on obligations. The system can handle existence of magic if one wishes as well so it could be run that way as well.
As just another option for people to consider especially if one likes PbtA games. It’s second book brings to the table in some form, havent read that one yet, so it could propably do altered carbon as a setting as well.