I'm glad to know others still care, but I have bad news.
Spoiling is commonplace, even "ruining the distant ending for no apparent reason" spoiling, and good indications are that nothing will be done about it. Suggestions are born and die in darkness.
I mean, the person you quoted and are replying to has even addressed this.
But, honestly, as a person who regularly uses spoiler tags in comic comments for various reasons, I would kinda really like to not have to type them out manually every time. And maybe it would ever so slightly reduce the amount of people asking "how do i do spoilers" in comic comment sections.