Is there an open source massive level world game that one could use to have a game-like real protest safely from the comfort of my home?

There could be an untapped world of possibilities! Like you can create effigies and burn them with nukes from a mech flying in space.

It needs to be a completely legal game that anyone can download ptp or centrally. Then the protest part happens when everyone and their gramma jumps in and clogs the pipes running the inter web. Re member the internet is not like a truck!