Unity is at it once again it seems. Perhaps they are prepping to release their own (worse) version of SoS or something, so had to think of a way to kill off competition. Either way, it's nice of Improbable to be giving financial assistance to developers affected by this (and other help such as porting) whilst they try to resolve the issue.
Nothing really nice of them to be doing... as you stated unity is looking to clear the field, which would include their operations. You see companies provide help to developers that are affected quite a bit. I remember MS coming into a contract to help get it going on .NET when .NET was a new tech in order to steal a client from the competition. Borland wasn't looking, so lost a lucrative contract when they moved away from Delphi. Earlier, Borland had done the same to get a different contract that I was on.
Sorry, I should have pointed out, Improbable
are the owners of SoS (the main thing affected), and they are providing financial assistance to other devs affected by Unity screwing them over. Unity has taken the "f**k you...deal with it...not our problem" stance.