Stalling - to perform any action which inherently and intentionally takes an (arbitrary) unnecessary amount of time in-between conflicts, or would prevent the opponent from initiating conflict.
In the case of the freeze glitch, if the opoonent doesn't SDI to ungrabbable places and the other person doesn't hit you to ridiculous percents, I don't see how FGing would be stalling. If you get a successful freeze glitch, it is a promised KO, just like wobbling, and if the ICs player wanted, they could get you to 999 with the freeze glitch OR wobbling, in which case that'd be stalling.
The reason it is banned is it is a completely different mechanic than wobbling. When you freeze glitch, the actual game can freeze. I've had the game freeze while freeze glitching on certain stages. When you freeze glitch, the opponent can make the game unendable/make it end on time, too. That's why it's banned, too. If the opponent isn't a **** who SDIs up, I'd vouch for it being legal honestly.
EDIT: Something should be banned if it is currently over-centralizing and dictating the flow of the metagame heavily, or if it creates obscure scenarios that would make competitive play less competitive. We ban items because they make the game less competitive. Metaknight was banned in brawl because it fit this criteria.
So, when banning something, I guess just ask yourself "is this influencing the metagame enough to be banned? Would the game be a better competitive environment with this tactic/character gone? Does this character/technique create scenarios where the normal competitive environment becomes perverse?"
Wobbling says no to all of these questions. Wobbling is not overcentralizing, the game would not be significantly better without it, and it CAN create scenarios where the competitive environment gets ****ed up, like stalling, but we have an effective, arbitrary ban against stalling that is rarely needed to be brought up or enforced. Freeze glitching is banned because the last question, and maybe the second question, identify the freeze glitch.
The whole freeze glitch thing is much more arbitrary though, because if it was legal, I don't know that too many games would end with ICs being unable to get a grab after freeze glitching. I guess it is the possibility of SDI that makes it illegal...?