A crack in the middle of the screen or a scratch?

I’ve got weird think. One say I wiped the screen with a soft microfiber. No problems was expected, but later I found I tiny but apparent line on the screen which add a kind of refraction (not sure) and a “rainbow” affect. Mostly noticeable it’s when you move, it’s really like a refraction.

So at first I thought it’s a scratch. But there are not one but many, the only difference - it’s mostly parallel to a pixel grid which could make it more apparent. But I start to fear - did you ever hear of such cracks in the middle of the screen appearing without a rough impact to it? Or it always breaks the screen if so?

To a nail it’s similar to a scratch, but a bit more prominent and sharp. If I press a bit with a finger screen stays as it was, not signs of damage. If I drip a drop of alcohol on the scratch it does not seem to disappear what’s worrying - in my logic it must hide being filled by a liquid. But if it does not…

The point is - can it be a start of a progressing problem which would ruin the screen or simply a minor issue?

Here are some photos I tried to take to show it: