2

I tried Torn edges, but my results are noticeably different from these pictures

https://www.instagram.com/p/BoHdd2ijqNG/

enter image description here

3

From original image - yeah, don't ask ;)

enter image description here

Add adjustment layer - Threshold

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Flatten result.
Add layer mask [reveal all].
Select all, copy, alt/click mask, paste.
Invert. This should leave the black but make all the white transparent.

enter image description here

Add new layer, drop it behind.
Use paint bucket with flat purple.
Filter > Noise > Add Noise

result…

enter image description here

3

My answer is similar to Tetsujin's method, but created non-destructively using a Threshold adjustment layer, grouped with the image layer, then the group set to "Multiply" mode. A noise filter can then be applied to a purple background Smart Object.

For greater similarity to your examples, it's probably best to start off with a photograph taken with low key lighting (i.e. dark background and strong highlights).

Example:

enter image description here

The benefit of doing this non-destructively is you can adjust the Threshold and Noise filters after applying them.

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