Is this a friend request, a space invite, something else? Can I find a description somewhere or am I supposed to get invites from people I know?
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Matrix doesn’t have “friend requests” so it’s a group or space invite.
And yes, you can be messaged by people you don’t know, if they have your matrix address.
So probably spam if I don’t know the person?
Definitely spam. There have been bots around that advertise crypto scam Telegram channels.