I think a legal remedy here won't work. It can't magically produce money or desire to keep something runnable indefinitely. And any regulation that tries to compel work without payment seems like it will just hurt indie developers more.
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For indie games, would an exclusion like "games with less than 1 million lifetime players" be enough? That's not an unsolvable issue, especially as indie games are not the main games people are worried about being killed. Most indie games will not be 'killed' by the developers because they're not releant on servers that the developer cannot afford to host.
Lots of indie games I see just use the storefront's APIs for multiplayer matching, not even requiring a matchmaking server.