The issue I imagine is the stress and horror of being trapped in a coffin for several days beforehand.
The issue was never charging for the API, it always started off as the insane price, the lack of communication, and the timetable for these changes.
Then it became all about u/spez's behavior. Most of the subreddits were going to do just a two day blackout but his actions really made people realize what a piece of shit he is.
Re: Your edit
None of those fail-safes matter if it's snagged on anything, and judging by all the cables and other stuff on the outside I wouldn't be surprised if it was snagged.
However, I think the buoys 'hearing' banging does sorta mean it's closer to the surface.
They can't use a flare gun or even leave the submersible because they were sealed in from the outside. They are likely on the surface because the banging was picked up by buoys, but the search area is so large that it's unlikely they'll be found. Also the banging is part of the search and rescue process as they bang every half hour.
Frightening.