great question. simplex is decentralized and there aren't any persistent ids (global identity), you have chat profiles that can be deleted at any time and incognito mode (which protects the privacy of your main chat profile...which can also be deleted at any time).
as i see it, the main privacy disadvantage of making one's simplex chat address public would be in possibly tying that chat link or chat profile contact qr to one's identity (for example, sending the invite from an account tied to one's real name) via the means of distribution etc.
however, that chat and that profile is just one of many possible (there's no global identity) so as long as the user's ip address is hidden by connecting to simplex servers through tor (in settings), then the ip cannot be tied to the user so only that chat and user id would (in this hypothetical scenario) be associated.
the other chats and chat profiles would not be tied to the 'public' chat or chat profile so they would remain unassociated.
make sense?
a user can always delete their invite qr (one time use or persistent) and change their identities (or go incognito) while retaining their contacts
check out the links below on group links and contact address
Here is a blurb that you may or may not have read yet...but i feel is useful.
'SimpleX protects the privacy of your profile, contacts and metadata, hiding it from SimpleX platform servers and any observers.
Unlike other messaging platforms, SimpleX has no identifiers assigned to the users. It does not rely on phone numbers, domain-based addresses (like email or XMPP), usernames, public keys or even random numbers to identify its users — we don't know how many people use our SimpleX servers.
To deliver messages SimpleX uses pairwise anonymous addresses of unidirectional message queues, separate for received and sent messages, usually via different servers. Using SimpleX is like having a different “burner” email or phone for each contact, and no hassle to manage them.
This design protects the privacy of who you are communicating with, hiding it from SimpleX platform servers and from any observers. To hide your IP address from the servers, you can connect to SimpleX servers via Tor.'
LINKS
Group links
https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20221108-simplex-chat-v4.2-security-audit-new-website.md#group-links
Auto-accept contact requests
https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20221108-simplex-chat-v4.2-security-audit-new-website.md#auto-accept-contact-requests
p.s. you can hide or mute chat profiles, just long press the profile for the menu 🤙🏻💜
