Yeah, honestly, that's what the majority of everything does. An insane amount of people freely download malicious apps without any further research or anything, let alone know about open source being a thing.
However, I think certain communities, such as SelfHosted or DataHoarder, would start gradually using Lemmy more due to the nature of their knowledge and awareness about things, which might slowly bring over more people.
I've also seen Lemmy mentioned in a lot of threads about the subreddits shutting down in cooperation as a protest against the Reddit API change. Most are casual users and won't care, and that's unfortunate, but if more and more start spreading awareness and migrating, maybe there'll be a better chance of more of those 80%+ coming here...