3, I'll answer your 3rd question first. I am/was a Fractalist so I never DL Content I have download some Mojoworld freebies as I also use Mojoworld as well as severan Fractal apps.

1. I use Mandelbulb3D, Mandelbulber and Apophysis Fractal apps and Mojoworld Planet builder.

I changed because AI afforded me to do things I couldn't otherwise do, I did AI exclusively for about 6-7 months but recently stopped using AI because of financial reasons.

2. AI was fascinating, 

3. Never bought 3D Content or DLd 3D freebies

4. I have used Mojoworld and Apophysis 15 years or so Mandelbulb3D, Mandelbulber since their inception...what 10 yars ago or so

5. Basic

6.  Oh hell yeah a day without learning somethin new is a day wasted. AI has improved my Lighting abilities and Composition in Fractals and Mojo

Remember...No matter where you go there you are