@nevian70gr
First off, highly appreciate the scanlation, even if I don't really like the story itself.
I've had things spoiled myself a multitude of times, and the only true way of not spoiling yourself is to not look at comments for anything. Even "stay offline" outright in some cases.
Whether intentional or not, people can and will encounter spoilers. People will also post spoilers/ future plot points all the time for various reasons as a means of discussion, "knowledge superiority", etc.
So, what I'm getting at is it's always going to happen. Even with the spoiler button around, and it being against the rules here for posting future event spoilers in comments, it will. Whether intentional, as a mistake, and/or just plain ignorance to rules.
At least around here, you can report a comment for spoilers. Whether that gets things done faster or not than asking the user yourself, who knows.
Anyway, based on all that, I'm saying I feel like you should stop. I personally wouldn't want you to stop your work, but that's a potential setup for (bad) trolls. And even if nobody's trolling, that's setting yourselves up for disappointment/frustration since it happens rather easily. Collective punishment, at least for what I've seen, almost never results in something good.
I'd also hate knowing that those working on things are upset. Whatever the reason really. So if it does bother you, I ask you to stop to keep your own happiness.
Edit: Oh hey, mods forced the spoiler since I started typing this, so that's pretty cool.