Tried remote Raiding Gmax Machamp, and it was a complete disaster.
We were around 30 players and still barely dropped 1/3 of its HP. Good thing I at least didn't waste coins on a Max Mushroom that wouldn't have made any difference. These Raids are doable if you're lucky and join a lobby with a high number of players who have optimal teams and strats, otherwise it's pure gambling, which wouldn't be an issue while attempting the GMax raid locally (because you don't lose Particles if you fail), but you do lose the remote raid pass.
So yeah, definitely wouldn't recommend it unless you know you're in a lobby with plenty of Pros. Otherwise it might be more fun to just trash your remote pass.
I'll have to try Legendary Max Raid once one worth doing comes up, those are made for 4 players so it should be a lot more viable.