yes. But companies will be scared into only releasing devices that meet the spec if there is a decent risk that non-spec compliance leads to the whole company

yes. But companies will be scared into only releasing devices that meet the spec if there is a decent risk that non-spec compliance leads to the whole company having their imports blocked. Besides, forwarding packets for another wifi user will likely all be handled in the wifi chipset, so there will probably only be ~10 implementations by the ~10 companies worldwide who design wifi silicon. And if you're splashing out tens of millions of dollars on a wifi silicon design, you probably are going to make some effort to getting it sufficiently spec compliant to not be banned.