Resigning randomly?

So earlier today, I was playing a game against someone (10 minutes). I am pretty low rated now, only around 200 in rapid, but this player I played with just resigned in the middle of the game when we were both equal. The opponent had a material advantage of about 5 points (for capturing my rook) and he also had time pressure as he had used 5 minutes of his time. At the point which he resigned, there were no checkmate threats, and the only threat was to fork both rooks with my knight.

Game link: https://www.chess.com/game/live/20353265307

Why did the opponent resign randomly?

It's possible the player just closed the game, which is considered resigning as far as I'm aware.

Or he intended to offer draw and clicked the wrong option.

But then it would say that the player had disconnected and I would have to wait 1 minute to claim a victory. This was just straight-out resignation.

There's a pop-up after you click resign that says 'Do you want to resign?' There's no way to accidentally resign.

Their real life got in the way of the game?

Phone call from Mom, or work or the youngest kid just took a nose dive into the coffee table etc.

Here is a game from an old account. That was one of the most random resignations I have witnessed (daily ratings are way less inflated today than they were back then as you can tell from the game quality).

It is a computer bot gathering information from players. Then it will play out the rest of the game with itself. It will share this information with other bots, and then the bots will become stronger and destroy you next game.