Chromium still has MV2 support in the extension loader as of the current state of the Chromium repository at https://chromium.googlesource.com/.

This means that both Microsoft and Google have elected to disable support at build time and alternative, good, Chromium based browser like Helium (https://helium.computer) still support it. As a matter of fact Helium still uses it to fetch and run uBlock Origin out of the box for mitigation against trackers, malware and ads.