1) No fermenter is airtight. A brute is no more open (or closed) then any other fermentation vessel, no matter what you think. You don't WANT an airtight fermenter in most circumstances, unless it's like a keg or a conical that can contain an explosion. What do you guys think a blowoff is, when you're fermenting beer? I is a situation where for whatever reason (usually a hop particle blocking the bottom of the airlock) causing the vessel to become airtight and pressure building up to the point of lid failure.
The bad stuff, are not ninja acrobats, they can lift a lid that is sitting on a vessel, you don't need to use a for knoxian security system just to ferment something.
2) people have been using these for wine long before anyone thought to use them for beer. They are just without the fancy white lable slapped on from the homebrewshop. You can use these things to contain stuff, just as long as you'd use any other plastic fermenter.