Just upthread someone pointed out that after the Homelab subreddit set up a Lemmy instance, only 18 people joined it. I think this undermines the idea that Reddit communities care about this.
What we know is that people who spoke up about this care about it. People who voted in a handful of subreddit-run polls care. But obviously, people who don't use the API in any way are going to be neutral, not positive, about these changes, and so they have no reason to interact with polls or speak up in Reddit's favor. They'll just ... remain silent, and wait for the storm to blow over. Which seems to be what the majority of Reddit users are doing.
Disclosure: I'm a 12+ year Reddit "power" user, and I don't care about the API changes. I didn't vote in any supposed polls on the changes. My perspective no doubt affects my understanding of this issue.