My springtails have completely left now???

Ime if there's springtails when you lift a pot you'll see them, if I lift a pot there's 0 under them, I'd noticed a decline in them (mentioned in the quoted post)
So about a month ago I looked closely over the medium of seedlings i had going using a 30x loupe but i couldn't find a single one?
I've had them for ever idk why now they'd disappear now without any intervention?
They were part of the coco recycling team.