I believe that it should always be easier to get away with fouling in DB than in BB.
Besides, as long as the fouled players don't get injured too heavily you can always sponge them back into the game.
I guess stalling the game is a tactic which I find a bit unfair since DB now has limited time. So the team that is trying to score is pressured to score a TD before his players (especially the ball-carrier) start to disappear.
While the fouler's only concern is to outnumber his opponent.
Another disadvantage is that for the coach who's trying to score, who disappears and where they were standing is very relevant (it is nearly impossible to score with just your weakest players or with all players in your own ez), while this doesn't matter for the fouler; his only concern is to have more players on the field.
You could easily discourage stalling by creating bigger maps where the chests and warpstones are much farther apart than they are in the usual maps. I assume that spreading out the players over a large map makes it harder to foul. Especially when your MV is better than the 1 who is trying to foul you.
I used to play on maps which covered my whole attic, but now that DB has a time limitation I figger that introducing bigger map makes the game unplayable.
Simply because finding the ball on a very large map where the chests & Warpstones are spread out much farther apart from each other instead of near each other could take a (very long) while.
Which, unfortunately, also makes scoring within the time limit impossible.
It seems that I find the time limitation my biggest concern.