Anyone pro-war, they just eliminated a major incentive for peace. That includes the more right wing end of both Russian and EU and US governments.

Anyone else selling Europe Gas (or Power). That includes chunks of the middle east and north Africa as well as Norway and Belgium

Anyone Buying Russian gas (China)

Anyone competing with European Industrial Goods (the USA)

Also, it's entirely possible this was just an accident.

Or there may not be a direct benefit: hackers (interference with control systems seems much more likely to cause multiple leaks like this) may have done this by either by accident, maliciously, or as part of some ransom plot.

This list is actually sort of everyone...