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This is just my own opinion but I don't think anything in the first episode of a multi-episode work should be spoiler-tagged.
I would back that. If it occurs in the first installment of any work then it is basically the set up for the series. It would be like spoiler tagging Sisko's name in every Star Trek Deep Space Nine example because he was considering leaving, but decided to stay on at the end of the pilot. Theoretically it is a spoiler because part of the pilot was him wavering, but in actuality it is just finalising the status quo for the ongoing series.
Edited by CrypticMirror
I agree. By not keeping that fact under spoiler tags, you risk spoiling the first episode for people who haven't seen it. On the other hand, if you start reading the trope list for a work where you haven't seen a single episode yet, you're really reading at your own risk; more or less eveyrthing will be some kind of spoiler...
There's a pretty major First-Episode Spoiler in Mystery Skulls Animated: the ghost who's one of the main antagonists is Lewis, a member of the group who'd been killed by a possessed Arthur.
Until a week ago only one video was out, so it was natural to keep it under spoiler tags throughout the page. The second video just came out and the series is planned to be five to seven videos in total: how long should it stay under spoiler tags? Until the next video comes out?