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Ok so we have fields like gravitational, electric and magnetic , now theoretically the fields don't have any upper limits of their strength at a given point in space if I understand correctly but practically what limits a fields strength at a given point of measurement ?

Okay take gravitational field of a black hole for example , according to our current understanding the field inside the event horizon goes to infinity as there is so much mass at such a infinitely small point, and because mass gravitates it can make up a field which is so strong.

(theoretically)Would it be possible to make a black hole using electric repulsion , attraction of charged particles which also have mass , like having an extremely strong say negative potential which would attract positively charged particles and crush them in a place so small that later on given enough mass of the particles it could turn into a black hole?

I ask this because gravity is much weaker as a force than electromagnetism , and if it takes a star of huge mass to later fall into a BH then why couldn't it take a much smaller mass of charged particles and a extremely strong negative potential to crush that into a BH.?