[golergka]

Since Youtube and most streaming services started to automatically balance tracks based on their average perceived loudness (not all of them use the same metric, but the purpose is the same), loudness war is almost dead. If you brickwall your song, it will not be played louder than competition anymore.

[copperx]

The algorithms that determine perceptual loudness are very inaccurate, so it's still possible to game them.