It doesn't matter because it's federated so you can search all across the funkwhale. You can search for a pod with rules that are comfortable for you but for the first time I don't think it's matter. I used this pod
Yes. Scroll to the end https://pixelfed.org/features
I need to learn about it more because I don't think I have strong knowlege and I don't want to install something that I don't understand. Also would be great if someone will create community about i2p