And that people are generally pretty stubborn about their social media these days. While the migration to Lemmy has been significant, it's still a tiny proportion of reddit's total users. Most people just want to see their feed and don't care overly much about the specifics of how it's run (even if they should) - and even those who do will often put up with a lot of BS to stay in their comfort zone.
Look at Twitter - you've still got tons of people who despise Elon and his changes to Twitter who are using the platform every day. It's been half a year now with things only getting worse and these people are still clinging to the platform because it's where they're comfortable. If anything, Elon showed that you can give your community some serious abuse while still maintaining high user counts