>Despite the fact that the Chrome devs spend considerable resources on fixing the MV3, and the dynamic is definitely positive, there are still many questions left.
Keep in mind that adguard's main product is a desktop version that effectively mitm's all traffic so they can block requests or locally inject JS & CSS directly into the page without needing browser extensions (which is admittedly pretty clever, but I don't like the local proxy approach). Purely from a business perspective, MV3 is actually good for them because it means that this desktop approach becomes the only viable option for full-control over the request lifecycle.