No anonymous posting means what? Credit card verified accounts? Mobile number verified accounts? On all websites or just ones that meet a threshold like Facebook and Twitter?
What happens to sites hosted outside the US like the lemmy instance you use? Are they blocked? Does the US try to prosecute them and get them extradited like they do with pirate sites?
GDPR violations result in fines. It also applies to entities engaged in commercial activities.
You are foreign to me and in fact a lot of misinformation and propaganda comes from the US. I would not block access to US media.
You still haven’t answered what would to the Lemmy instances you currently use and allow anonymous (email as verification is not very hard) posting.