Devaluing the platform before the IPO sends a clear message to Reddit and other, similar corporations that the data on the site belongs to users, and not the site. If the userbase quietly leaves, then Reddit’s behaviour will be SOP for many sites, because it woul show you can take a steaming shit onto your userbase and come away Scott clean.
Lowered user traffic is worse for their IPO than tons of user traffic and a few subs protesting. They know all those people still protesting are hooked and aren’t going anywhere. Eventually Reddit will replace all mods who don’t play ball, and things will be back to business as usual.
If everyone who was unhappy with Reddit left the platform, that would do actual damage.