You may be right, i am no expert coder, though I do have some experience with programming, used to be into c++ and delphi and pascal etc decade and half ago.
But, I dont see what can be so complicated about grabbing an image if you just code it properly to understand that images of various common formats are images when linked directly, such as
www.domain.com/image.jpg, and then have that jpg auto grabbed, uploaded unto own server, and embedded into the post.
There are certainly more complex extensions out there than what I am asking for, and I do think it be possible fairly easily for those with experience in the php and phpbb coding.
All it needs to do is recognize an image file, and then auto-embed it after quickly uploading to own server.
If I wasnt too busy with my other work these days I would put my nerd googles on and try get it done myself but I have been out of that game for a decade now and involved with completely different thingns.. Anyway, hopefully someone can help out with this.
Cheers