telemetry is almost never opt-in AFAIK.
Valve doing it is one thing, but a game that requires identification over the internet to play LAN because the game dev wants to know who play and how much time even if they don't use steam, is a thing that prevent/deter player.
If there is a thing such as " no server without telemetry" that's what it means, and that's close to a DRM that doesn't say its name, which can be deceptive for a game on GOG.
That's why i'm curious, i advise the game everytime someone ask we which game i'm playing and that's almost the only thing people ask me
![Smile :)](./images/smilies/icon_e_smile.gif)
EDIT: yes typically i have disabled the crash log, because when i have 1, usually i fiddle around until i can make a proper bug report, so that would yield 10 20 crash report, and sometimes i even cause crash when i fail at editing some mods,those doesn't need be sent over the internet
![Smile :)](./images/smilies/icon_e_smile.gif)
EDIT2: It clearly says in the 17.59 changes that direct-connect and LAN games does not require user authentification ,only public multiplayer , i assume equals "valve matchmaking". Which in this case, is not the thing called "no server without telemetry".