They are not uploading early because they need time for the author to earn money that's why they upload it after 2 or 3 days
It’s just kinda a courtesy thing. Most importantly it allows time for the author to get their deserved profit, but it also avoids issues where multiple people are trying to upload one work and create confusion. The person probably had good intentions but it’s important to follow those rules
It's just as your title says—uploading etiquette. It's basically respecting the usual uploader's effort in snipping everything properly and uploading them in order. And usually those who upload over the main uploader upload almost instantly after the chapter's put up in the legal site which in turn decreases the chances of the author gaining profit. Some uploaders even schedule uploads a week after the official release to have more people read legally. The norm just then became 2-3 days after official release because many felt a week later was too long of a wait. So yea, it just all boil down to respect.
I actually don't know either i can understand it if they are translators but those who just take screenshots i think it's fine for anyone to share it with others (of course they also should wait 2-3days so the authors gain)
I'm not the one who uploads or anything but i see this issue a lot in multiple mangas, why is it inappropriate to upload chapters even if ur not the usual person that does it? Do u get paid? Or is it just part of the rules? I'm not trying to be inflammatory, just genuinely curious