Small developers have multiplayer games all the time that aren't affected by issues like the ones SKG is concerned with. Ad-hoc multiplayer and dedicated servers that players can self-host are long-established solutions. A common argument in bad faith is that SKG demands perpetual upkeep of presumed infrastructure that will somehow harm small developers, and it just isn't true.
To be fair they didn't make that argument, but thanks for the support none the less! Agreed, ad-hoc servers are a staple and a worked out problem. 99% of the time you have to go out of your way as a developer to make things not work in this way.