In one case, which was surprising to me, a man who had survived cancer - he was not terminal but certainly wasn't getting any better - elected to die via MAID after his wife died. She passed, he called his doctor and less than a week later he was also dead. He got a chance to visit his family, apparently drive around his hobby farm one more time and then that was it. He didn't want to deal with being alone and seriously ill.
Another friend was in renal and congestive heart failure and possibly could have lived longer but they were driving 100km daily to get to the nearest dialysis clinic and again, this person was definitely dying. So made and appointment and decided to go sooner rather than suffer along for an indeterminate amount of time.
It's quite surprising to me, but these people are in their mid to late 80's and of sound mind and know what they want.