This is first test how decentralized this exchange is. If it will somehow cease to exist then is not that decentralized.
This is a really big threat to the decentralized exchange model, I read sometimes ago that Idex would start blocking IP from US, I think the got hold of this information and want to be proactive, if Decetralised exchanges go under then this would give ceentralised exchanges more power and hold developer hostage and need to pay through their nose to get listed on this exchanges. I know what SEC is doing is applying Scapegoat theory and wait and see the ripple effect in the space
You simply cant shot down a truly decentralized exchange. I believe none thru decentralized exchange exist right now. Closest to it is BisQ. Most of other DEX that were founded thru ICOs are totally centralized and can be closed by governments all around the world in a second. BisQ is working hard for 4 years now. Without any ICO or anything. But this is a really tough challenge.