ChatGPT is already available to users in the EU. It already has an EU-aligned terms of service. Not that I'd trust them, because the GDPR has been borderline useless in reality, but there's nothing particularly legally interesting about this offering.
> How do these EU citizens submit a request for all their personal data to be deleted from OpenAI records
Probably by sending an e-mail to a designated address, like most services that operate in the EU, but you can read their TOS if you'd like to be sure.
> but there's nothing particularly legally interesting about this offering.
Care to elaborate or we have become completely apathetic to any display of sleaze?
I mean, it's just a literal non-event legally. I'm repeating myself here, but OpenAI already operates in the EU. EU users can already use ChatGPT, with some assurances about adhering to GDPR. Offering the ad-free tier to a subset of EU users for free, who could already use the tier with ads for free, doesn't change anything legally in regards to data processing.
If you want my commentary on the political context, obviously I think it's not very intelligent for nations to be trusting a US corporation with all of their citizens' data. I think the most impactful use of LLMs is going to be their usage as surveillance and propaganda tools, so this is probably not a prudent decision. But legally, as pertains to GDPR, this is not different from the status quo in any way.