thats what I thought several times, too.
I got the feeling that it doesn't matter what you write, there will always be someone who labels it as spoiler.
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Plus, there's not even a point freaking out about it. If it is a spoiler, the mods will erase it within a day, because some other manga reader will probably report them.
If it's still around the next day, you know it wasn't a spoiler.