What do you mean by “the relays the public and users can track from one another”?
Re: IPs, yes. Relays could triangulate to some degree but usually only for short periods because all the visible group ids change regularly. Tor and some trust in relays is inevitable.
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Some relays are collecting and selling information about users, like their interests and so on. Its likely that they will want to collect any info at their disposal to associate accounts/keys/secrets and sell them to the highest bidder. Picture Chainanalysis, but on nostr.
If that breaks the privacy of MLS, then there might not be a reason to do MLS at all.
😳