So, obviously an anti Lemmy bias there, and not entirely true, but there are some aspects of federation it can be dangerous to ignore.
There is a different primary privacy focus here, and it provides an extreme level of privacy but places an extreme level of responsibility on the user for their own privacy, more than most places.
There is a distinction to a potential scrape and a system designed to duplicate, often irreversibly at submit.
There are also other things people are often not aware of and the community is not doing a great job communicating. Admins are not doing a great job of protecting themselves either.
For instance many, still don't know votes here are entirely public.
If you understand this all and are comfortable, great. Many do not prepare themselves and would engage differently if they had a better understanding.
For a take by someone who is pro-federation but not ignoring these concerns see: https://lemmy.ca/post/948217
Everyone can see them if they use kbin and I think Mastodon which Lemmy interoperates with (ie. Kbin users often see and engage with posts on Lemmy and vice versa). Sign up to kbin if you want to see yourself.
All admins have access, and a rouge admin could very easily mine it.
I can see an argument for it, but does make you take pause on how you will use that feature doesn't it?