Where's the evidence that 'everybody' does it though in this case? Let's ask ourselves this - in any given play session, say, 1 hour, how many players are in game at once? How many of those are in open? Of those, how many actively engage in combat with other players (wanted or unwanted combat)? Of those (and I'd argue we're already at a small minority of players by this point) who engage in such PvP combat, how many actively, deliberately combat log via killing the task? Do the math, even only speculatively, and it doesn't take much to work out that such combat logging would only be carried out by a small minority of players, and only impacts a small minority of players.
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That's not to diminish the significance of the impact on the affected players or the impact of any inaction by Frontier, and even Frontier has acknowledged that it is cheating, but I doubt it's the significant problem, looking at the game as a whole, that posts like this make out. Yes, it's cheating, and yes warrants action by Frontier (if there is a demonstrable pattern of behaviour), but let's not blow the combat logging question out of proportion either.
You may want to read the post I was responding to, so you don't take my reply out of context. That context being that somebody said something along the lines of "loads of other companies lie to their customers, why should FD be any different, suck it up buttercup etc..."