I think the average person just simply doesn't care about their privacy.
In some of the music communities I'm in the content creators are already telling their userbase to go follow them on threads. They're all talking about some kind of beef between Elon and Mark and the possibility of a boxing match... Mark was right to call the people he's leaching off of fucking idiots.
Show me where activitypub actively tracks how much time you've spent looking at content, what content makes you stop scrolling, factors that contribute to you interacting in content, or any demographic information about you, etc.
Privacy is given up on the fediverse when you choose to post such information, (e.g. "I live in Ohio") not actively harvested as a means to craft ads for your eyeballs and sell to whoever has money.
Your comment is akin to "oh you don't like eating spoiled yogurt? And yet, you eat bananas... Curious."
I'm assuming they're referring to the recent post about how Lemmy stores your upvote/downvote history in databases accessible to all instance owners and not just the owner of the instance your account is on.