The unfortunate thing is that those who want privacy can get it online. It's not particularly difficult.
I think this scanning should just be allowed, not required. That would trigger big tech to do their big tech thing: scan it all. And niche apps that 99% of people don't use anyways will still have the privacy some look for.
Effectively putting those safety measures up for 99% of people, while still allowing for individual freedom and privacy for those who choose to exercise those rights
The Lemmy devs will have to implement it as a feature. One that is, totally accidentally, really unreliable and very easy to turn off.