Streamer mode being used to avoid being reported
Streamer mode appears to allow people to play under a alias. The problem with this is that this is being used by people to avoid getting reported as the person does not show up under "Recently Played With" under the alias that they were using in the match (either that or someone has figured out how to spoof their ingame name using this feature).
The fix for this would be to have these players show up under the alias that they were playing with during the match under "Recently Played With" - it would be easy enough to anonymise their EA ID to avoid people griefing them.
For example, I was just in a match of RedSec and was killed by a guy under suspicious circumstances. The player showed up as "Itsasecret" but no one in my "recently played with" had any sort of indication that this was them.