Backlinks from 'backlink' sites appearing from no-where

Hi

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Recently my websites been added to a load of random web directory sites.

In the last 7 days it's been added load of sites like

webrankdirectory.whatever

topwebdirectory.whatever

backlinktime.whatever

I have never paid or undertaken any services of any outreach or link building and all my links have come organically.

So why is this? How was my site scooped up by these? Or could it have been more nefarious (competitor?)