How frequent is phishing? In big tech, and in general?

Greetings, all!

Currently, I am building an AI Anti Phishing software, but firstly I would like to know if there will be a demand for it.

I would be very grateful, if you answer few of following questions:
1. Have you experienced phishing in companies? What was company's size, and how have you dealt with it? What were the consiquences?
2. I would like to know, if you/your friends as CEO/CTO/Founder, or for personal/family use (for grandmas/moms/children + I'm considering additional features for family use),
Would you buy such software, assuming detect rate is 100%?

I am struggling with moving forward, because idea seems to be good, some people said that they would 'consider' such purchase, but it is not an answer.

Additionally, if you have a wish, I'd like to have some 'roast' of landing page..
I know it is not attractive as it could be, but I'm student and don't have much money for it.

Thank you very much for the time of consideration, and have a great day! Stay safe!