3 Qs if you're a fractional CMO

Recently I'm conducting user interviews with experienced fractional CMOs. I have 2 Qs:

1. What kind of startups (industry, revenue, funding) are the most fun ones to work for in your experience as an F CMO? What are the types of projects you've mostly done for them?

2. Why do those startups hire fractional/freelancers instead of full-timers? Think back to the teams, capabilities and lackings of the companies which hired you.

3. What's the pricing like mostly? Is it monthly retainers or project-based? A $$$$ range would be helpful.

Feel free to be as detailed as you want. The more context I have, the better I can add meaning to your responses. I appreciate this very, very much.