A number of people can see your IP, people will chime in and add to ane remove from this list:
Can't see it:
Random people you personal message with
Random people you chat with in rooms
CAN see it:
Server admins
People you share (send/rcv files with) // this may have been fixed
People who send you links and you click them, but this isn't specific to Matrix, it's a tale as old as time.
You voice call with someone (may have been fixed)
Some info may be wrong. But having someone's IP in the days of routers and all filtered ports means little, unless you piss off someone who knows some low level customer support person @ your ISP to pay to get your account info. Or you're dealing drugs in which case use TAILS and stop fucking with technologies you don't know the specifics of.
If they knock you offline and you can't access anything at all, unplug your router AND MODEM (most importantly your modem) for an hour. Go touch grass for an hour. Widdle a wee branch. Plus your boxes back in and you'll be bright as new.
@possiblylinux127@lemmy.zip this isn't meant to be a dig at you, although last time you didn't care to correct or learn if I recall,but often times you leave out the "if so," "possibly, what and XYZ?'" and it ends up spreading misinformation because you didn't know enough or care enough to type enough.
I love Matrix but we need to be open about what the fish is before skinning it..
Do a lot of reading. Get a cyber informations systems basics overview on your own self-teaching before you try to understand it all.
Stay away from session and matrix. Signal, Nostr, SimpleX (nvm if you use Apple products) and the like are okay, but they are all hobbyist influencable products besides Signal which gets fat government grants and just happens to use the same encryption standards as all other huge name E2EE tools.
Stuff is fun to learn on, but get a good VPN (debates about.... mullvad, ivpn, cryptostorm seem okay). here's something fun for you and free: https://www.thc.org/segfault/
So Matrix protocol is bad because criminals use it to distribute illegal content. That's the same as saying Tor is bad because people use it to do illegal things on the dark web. Matrix is just a protocol which powers a decentralized network. Is it better to have proprietary centralised platforms where a small number of people control everything?