I have the limited amount of English Full Colours on-hand, and while the font, spacing and whatnot are different, the actual dialogue is the same.
If they feel it's significant or unique to be up despite the rules.
I will admit I could see a small amount of worth when you still had to pay through the nose to actually get the complete manga from my research, the cheapest option before the Shonen Jump service was something like £250 for the whole run? You can even go back and read the first 194 chapters that you skipped.
You can apply callouts, lines, text, and more without needing to pause.
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It does not have a steady shot feature like the Sony, however using a small handle attachment or telescoping selfie stick I did not experience to much camera shake.