Rather than "having a go" I've been doing this for close on 30 years.
I've seen a lot of flying schools come and go in that time. Most have failed because of poor business practices, unrealistic expectations, bad decision making, lack of financial discipline, inability to adapt to a changing business environment, (particularly following privatisation of the airports) in other words the same reasons ALL kinds of businesses fail, not because of CASA. The only one I have seen shut down by CASA was China Southern when they couldn't find the key personnel. So that hardly shows them favouring the big schools.
I'm not still here because of luck and certainly not because I am naïve. I am realistic.