Idea: Defensive BM doesn't have to be permanent. It could expire, after 120 seconds, the time of a Mutiny. Let's refer to it as DEF for now. DEF is placed on a tile, just like a Goon Squad. A DEF that expires prevents any further DEF being placed on that tile. So an expired DEF on an Offworld opens that Offworld up to pain. On the other hand, anything which reveals a DEF (such as PS or EMP AOE) triggers the DEF's catch ability. This returns the DEF to your inventory, so you can reuse it again somewhere, with its full 120s duration.
Effectively, this turns the FFA BM into mindgames rather than brute force. In the current meta with Goon Squad, players throw out the PS/EMP no matter if their opponent has a Goon Squad or not. If you know there's a DEF, you should wait out the 120s. A successful DEF catch is totally positive. This rewards knowledge and outplays.
Some combination of this and GalacticWino's Blackmail idea could be the foundation for an interesting alternative to the current Goon Squad. A suitable name would be "Paranoia" - its use means that you fear someone will hit you, and you will reap the benefits or costs of that paranoia.
As a side effect, it used to be that EMP > Goon > PS, but now both EMP and PS defeat Goon Squads because of the reflection mechanics. Paranoia completes the RPS by being good against both EMPs and PSes.