I think the big defining question is what will the AI features that they will implement do exactly and how will they run. If it’s something that runs in the background (even as unintrusive as the summaries on a search engine like DDG), then it’s opt out by default as it’s constantly running whether you want it to or not. If it specifically and exclusively runs when you hit the button to activate it and doesn’t run at any other time, then I’d say it’s unequivocally opt in. And regardless of what a company says that their software will do, at this point I won’t believe it until somebody has done a full teardown and discerned what exactly it does behind the scenes. I’ve seen enough nonsense like the Epic Games Store accessing your browser history and recording keyboard inputs or whatever the other absurd incident was.