Beginner to BCH - Have some questions

I'm a beginner to crypto and recently I've started studying about Bitcoin Cash, got to admit that I'm very impressed by this community of BCH.
We all know that BCH is a fork of BTC, which has me thinking about a few things.

Blockchains usually set higher fees due to network congestion which is the case with Ethereum and maybe BTC as well(not sure 100% about this one though). Since these networks are so widely used and hence naturally have congestion on them, they have resulted in higher transaction fees.

Now my question about the transaction fee is that how come that BCH has such a low fee and how will it continue to offer low fees as it grows bigger and bigger? What is there to prevent it from having higher transaction fees?
Does BCH have a lower transaction fee defined in it's blockchain code which will prevent it from rising higher as it gets congested? Or is it something else which I don't know?