Spot burning is bringing unwarranted attention to a fishing spot. Spot burning is a touchy subject and also a context-specific one. In some places with low angling pressure spot burning is generally not a concern while in other, typically high-pressure places it is a major breach of local etiquette.
Spot burning is generally regarded as a negative thing for reasons like:
On the other hand, cries of spot burning can also be wielded by bad-faith individuals. Some people just want fishing spots all to themselves and will try and bully other anglers out of the area. Some people take anti-spot burning to the extreme where they don't want people talking about fishing at all. Apps like Fish Brain, local tackle shop reports, and online groups and forums often find themselves tangled in the spot burning debate.
Fishing Fundamentals