Congress limits what action the SEC can take unilaterally. For example, they can only suspend a stock for a maximum of 10 days no matter what. The view is - why should they get between two willing participants to a trade. The suspension action is meant as the ultimate "warning" to investors that there are serious problems. At that point when it reopens on the greys, if two people want to trade...then so be it. But it won't be facilitated by a market maker and no quotes.
Most investors understand the seriousness of a suspension and the futility of trading on the greys which is why suspended pinks pps dives when they re-open on the greys. It is also why no suspended pink has come back from the greys in the last 1000+ suspensions, and for the few that did in the thousands before that were never successful.
Many will try to spin the idea that "it still trades" or "was only suspended for 10 days" as somehow a hopeful or positive attribute when in fact it is meaningless.
At this point Adminstrative or Criminal legal action would come next...but usually after quite a bit of time.
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