I wasn't asking for advice on whether I should have withdrawed so I don't see how my reasons I relevant to my post.
I disagree: in this situation, your reasons for withdrawing are relevant - at the very least, your preparedness to be open & honest might suggest that you understand the inconvenience and loss to the Department of your last-minute withdrawal (It could be put more harshly - as you renegging on an agreement).
But what would happen? how can we know that unless we're your Department?
Your posts are rather unclear - and you can't dictate how people respond to you, either in here or in your University. You can, however, take feedback from those responses. In this case I think what you're hearing from us - both explicit & sub-text - in the responses you don't want - is the likely response you'll get.
People mightily pissed off. As you see. Personally, I would be very annoyed, and you wouldn't get a second chance with me, unless you were prepared to be straight with me, and acknowledge the difficulties you have caused, rather than seek to deflect responsibility.
However, official consequences are likely to be minimal, as you've not received any stipend or equipment, or other resource (except academic time). I'd be advising my Doctoral College to accept your withdrawal. I don't want to supervise someone who's not committed - which is the reason you've given in your opening posts.
I'd then have to be spending precious time trying to salvage my Department's and my personal professional relationship with the funders and industry partners. I'd also be trying to woo the second choice for the studentship to come and replace you, which might be quite difficult to do. They will have been disappointed and legitimately suspicious or wary of a late offer. Particularly if all I could say was the first-choice candidate had withdrawn. They might wonder what sort of cowboy operation we were running with people withdrawing at the last minute. Because of course I couldn't make any comment on your behaviour or reasons for withdrawal (reasons which you haven't given me anyway).
Of course, that wouldn't be any concern or responsibility of yours. However, your reputation is another matter ...