Obvious but maybe because it's just completely impossible to stop the checkmate
Brilliant Move

Yea that is true, then he could go kf7 attacking the bishop for instance, or Qa6 covering the f6 square. I don't see black winning anyway but it does stop that attack.
White could start moving the d5 pawn which is covered by the rook, and maybe open one of the pawns on the kingside giving the king somewhere to move.
The brilliant move thing is frequently rubbish. I got one for moving my rook to the only square that didn't lose it this morning.

Because sometimes the most brilliant things in life are the most simple things. For example, banana pants.

From the bot's point of view, currently black is up a rook. After Qh6 f6 Bxf6 Re7 Bxe7 Kf7 Qxh7, white recovers his rook and is three pawns ahead. But opposite color bishop endgame, looks far from over, especially if there are clock issues.

Yea that is true, then he could go kf7 attacking the bishop for instance, or Qa6 covering the f6 square. I don't see black winning anyway but it does stop that attack.
White could start moving the d5 pawn which is covered by the rook, and maybe open one of the pawns on the kingside giving the king somewhere to move.
Kf7 is met with Qxh7+, leading to mate.
Qa6 looks solid. White’s rook is currently stuck preventing a corridors mate, which limits their ability to continue their attack. I’d likely respond with h3 and then use pressure on the king to just trade pieces and simplify since there’s a pawn majority in the queenside.

Actually even though they have the bishop... - Kf1 at the right time will eliminate the corridor mate threat and also position the king closer to passed pawns in the endgame.

Kf7 is met with Qxh7+, leading to mate.
Qa6 looks solid. White’s rook is currently stuck preventing a corridors mate, which limits their ability to continue their attack. I’d likely respond with h3 and then use pressure on the king to just trade pieces and simplify since there’s a pawn majority in the queenside.
Qxh7 doesn't lead to checkmate since the rook has moved from e8 so Ke8 and continue to d7 for instance if queen continues with check on g8.

The followup is moving the bishop. The queen keeps the king on the 8th rank.
1. Qxh7+ Ke8 2. Bf7 black moves (maybe stalls with Qxf2+ 3. Qe7#...
if 2. ... Kf8 3. Qe7+ kg8 4. Qg7#

Sorry, I don't follow your sequence. In the above position 1.Qh8+ is illegal.
You’re right! I meant Qxf7+, and updated the comment. Thanks.

Sorry, I still don't see it. Here is one sequence that leads to mate: 1...f6 2.Bxf6 Re7 3.Bxe7 Kf7? 4.Qxh7+ Ke8 5.Bf6 Qa3 6.d6! because whites B covers a1. But what if after 1...f6 2.Bxf6 Re7 3.Bxe7 black simply plays 3....Qb2? Or better yet, 3...Qxb3 and then after the rook moves, 4...Qb2? Sorry if I'm a little slow here.
How is this a brilliant move? I considered it as very obvious?!