It happens so often where we’re watching a series and as we’re scrolling to the right episode, we see thumbnails made from a clip in that episode. So like if someone was maybe about to die, now I know that’s not gonna be the case. And most of the time, the description says too much.
Edit: I should maybe specific that I’m mainly talking about services like Netflix, Prime, etc.
I’m using the browser extension DeArrow. It replaced thumbnails and titles with community created versions. It’s not perfect but it makes YouTube allot better.