On fee front, using Micro.blog is free if you host your own site. As the help document mentions (http://help.micro.blog/2018/pricing/), you can add your feeds from your external blogs and only use social aspect of Micro.blog.
I guess, though not right on front there, the ToS (http://help.micro.blog/2018/tos/) and Privacy policies (http://help.micro.blog/2018/privacy-policy/) are clearly drafted.