they already do

use force

taxation

But if they weren’t big enough to go tyrannical, then there is no way they could stop a decent sized group of people from banding together and looting a city

No?

Private police exists

Not too sure about anarcho capitalism

not one myself

What? IF who wasnt big enough? And yes the could go tyrannical but what would be the point of that first of all. And the second thing, as i've stated private firms, different private firms would go against these people. If you're stating that it is impossible for, lets say a high number of firms who have a high number of people working for them as militias, how is it possible for a normal military? It is more of less the same thing however those firms have high incentives to innovate and keepo the costs low since competition, the only difference is that since competition would exist, a single firm would not get as organized as the gov

and monopolise force

thats the whole point of anarcho capitalism

they wouldnt get tyrannical since they wouldnt be a monopoly

and yeah private police exists but theyre never gonna get as popular

for now

since theres gov

Or how about a scenario where a large army takes over an area and security companies aren’t able to combat it

Or how about a scenario where a large army takes over an area and government military isn't able to combat it

Thats a civil war

They happen

But they would be much rarer

why

why would they be rare and those wouldnt

Because when you have much smaller companies, they aren’t able to combat groups like that as well

how

since they have more incentives

Because the companies are weaker than a large centralized army

profits, competition, innovation etc

no how are they weaker

those have more incentives

and

they could not get tyrannical

since they wouldnt ever be able to form a monopoly

how are they weaker

Because they don’t have as many recourses

To build a significantly sized force

how do they not have as many recourses? how does the gov have

Because the government is an entire nation

What? Yes? And that is my point. They have a monopoly on basically everything. What stops them from going tyrannical. So to answer your other "question" about them nto being as effective. Those companies would be able to get to these resources, since nothing would stop them from getting them since they have incentives since competition. So they would be as effective as the government military

even more

probably

not probably for sure