Well, my experience is only anecdotal, but after the third party apps shut down (RIF in my case) I checked reddit less, maybe once every few days. This wasn't a conscious decision or a protest. I tried the main Reddit app and hated it. One of the key draws to my active participation in Reddit had been killed.
A number of subreddits I moderate were shutdown by reddit for being unmoderated. It turns out a lot of mods disengaged. None of the subreddits I was a part of were a part of the protests, but banning communities by moderators that disengaged achieved the same outcome as a protest effectively. Maybe someone has numbers for how many communities were banned for being unmoderated, and did this number increase after the API changes?
A number of subreddits I moderate were shutdown by reddit for being unmoderated. It turns out a lot of mods disengaged. None of the subreddits I was a part of were a part of the protests, but banning communities by moderators that disengaged achieved the same outcome as a protest effectively. Maybe someone has numbers for how many communities were banned for being unmoderated, and did this number increase after the API changes?