On the topic of privacy: the general idea is going to be that you will have the ability to reveal exactly what you want, to whom, and under what circumstances you choose. You already have that ability, in theory. But the grapevine will give you tools to fine-tune your choices. And you won’t have to publish your trust list in the same sense that you don’t have to publish your follows list. You may choose to give your follows list to a relay for the sake of performance, but that’s a tradeoff you can decide whether to make.