Blizzard has a problem with hidden networks of people that add-ons make.
LFG addons that use public channels and chat parsing shouldn’t have any issues with these changes. Just parse each word into a string, check if any of the strings match a key phrase/word for a dungeon group, then categorize the LFG messages to the matches.
Raid and guild comms are what Spy mainly use, because open comms create some vulnerabilities. You are broadcasting your own location. It can be unwise to do this at all times.