You have one big thing wrong with this...all 2700 entrants are donks. There really isn't much of a strategy to play games like this. Play tight, but it is likely you will get sucked out on. On these huge donkaments, it is really mostly about luck. When you aren't putting anything into a buy-in, you aren't going to get much respect when you're playing correctly from the other people. If you're playing freerolls
just for the hell of it for fun, go right ahead, but if you legitimately have no way of depositing and you need to build from $0, then enter every freeroll you can and grind. You will get lucky and go deep in some eventually, but don't get discouraged about it, and don't complain when you have someone call your AA and suck out on you with 57o, because you didn't put anything into it.