Is this really needed? Well, since the comics news sites seem to be unable to avoid putting in their links or headlines stuff like:
What will Lois Lane do when she finds out about Superman’s secret abortion?
Which the board then displays without any spoiler warning whatsoever - then, yes it is! (Did that headline actually happen? Not yet.)
Add to that the tendency of the big companies to spoil their big revelations a day or two before the issue(s) go on sale and it’s not good. If you want to be free of spoilers but haven’t picked up your monthly or fortnightly stash, sucks to be you.