I raised these concerns as well as others in the lemmy admin channels and was told I was causing drama and my only recourse was to make posts on hexbear. In the same channels I was personally insulted by three lemmy.world admins as well as three other instance admins, dogpiled and gaslit by the group of them. There were some lemmy admins that engaged in the discussion in good-faith and shared my concerns.
In addition to these privacy concerns I raised the point that the current largest instance was slandering hexbear and me, poisoning the well in regard to other instances federating with or blocking hexbear, prioritizing growth and active community consolidation and with the creation of their instance discord moving users away from the Fediverse entirely. I was blocked by the lemmy.world admins after I continued to ask for proof of their claims or to engage in discussion rather than insult me.
I maintain what I said in our federation post which is do not make lemmy.world accounts, do not make communities on lemmy.world, and I highly advise not posting/commenting on lemmy.world until they clarify their operations regarding data. As of now the rooki bot does not send federated delete requests so you rely upon the lemmy.world admins to delete that data from the discord.
