Privacy, do you realize you ate posting publicly? Don't associate your email to your lemmy user and never post any bit of info that can link to your real self if you want privacy.
There is not much expectation of privacy when you act public I am afraid. At least Lemmy, choosing your instance wisely, will protect your anonymity which is as much as privacy you can expect when going public.
Sorry man, but there can be no expectations of privacy when you choose to be public. At most, you can aim for being anonymous. Create e private non federated Lemmy instance if you want privacy in your Lemmy posts, the federation concept itself cannot guarantee you privacy.
I am all for privacy... Just do not expect it when being public myself in my posts and actions.