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Does it? I see email subscription at https://opensea.io/about

Can you explain a bit more?

It's a mailing list? You aren't forced to use and it isn't required to use the service.

I also don't see 'mailing list' in your list of complaints.

Erm. Well, no. But having an externally-facing mailing list doesn't suggest a lack of internal email. Unless there's something I'm missing?