FINALLY SOMEONE GETS IT!! These uploaders have let this go to their heads, its so annoying. Anybody can be a pirate!!
They can declare place holder at the end of the chapter (I see others do that), but this seph one is annoying. There's one manhwa that this person is updating too and he/she/they have like 5 placeholders. Like WTF
pretty sure the placeholders are specifically for the bots that will rip (usually) lesser quality translations from other pirate sites and upload it to mgg. the placeholders prevent that. though i think uploaders can choose to not notify readers when they post the placeholders. that's also why both the chapters and placeholder are uploaded at the same time
Please don't put place holders. It give us false hope. This is a free site. Anyone can upload.