It's been over 7 years ever since the organization system (aka gang script) was lunched and no companies are known to survive so far beside ALT. Every company comes around goes easily after awhile due boredom in the civilian life and you can't compare a company with a squad nor a gang as they got much interesting stuff to do.
Well, ALT was always known as their strict system in inviting people and if you could check our forums, there's no solo decision without discussing it with the whole company and then getting the approval from the HQ themselves. furthermore, There will be different requirements and a whole new fair recruiting system after taking this step and ofc under GM supervision.
Also, I agree with you that people shouldn't have more than a company in their list to avoid group hoe's.