The protest itself won’t have any impact. Two days won’t be enough to alter a single thing. Those that are going to remain dark indefinitely I wouldn’t be surprised if they are taken back by Reddit and assigned another mod. Corporate will win in the end, even if it does turn out to cost them.
Reddit will lose at least 25% of its user base after June. Hopefully more, but realistically, older audiences won’t understand or make effort to move off it.