And trash talking anybody who dared castle.
Early sacrifices are bad because they put both you and your partner down material. Against top players, they will not let you have the pieces you need to win, and they will defend all squares, and if you spend any time waiting for pieces you'll get down on time and definitely never get what you want at the right time. Bughouse requires very fast, very solid play at the top levels.
But defending in bughouse is hard, and piece flow control is hard (requires watching partner's board while still moving super fast), so the newer the players the more that just sacrificing stuff can work.
That said, the openings played in the video are not traditional Bughouse openings.
The most standard opens in bughouse are e4/e5 and d4/d5 now.
In the past, standard was e4/d4 vs e6 setups with black either playing d6, d5, or bringing our 2 knights and a bishop next. This turned out to be overly defensive by black as far as pawn structure, while Bc4-f7 sacrifice vs 1...e5 isn't actually very good (but seems good when players are newer).
Note that in e6/nf6/nc6/bb4 openings, or 1...nf6, or various others, it's pretty common for black to play aggressively and sacrifice material (especially if white is over extending). White isn't necessarily the aggressor and has no easy to to quickly punish e6 openings. White normally would get a good position with center control then apply pressure and try to win more slowly.
Something rather common was for most of the pieces to end up on one board, so my guess is that these strange openings are intended to block off places you'd normally use to drop in a piece that your team-mate captured. So it becomes more like Go,