Modular Phone: Google tried to get to a modulair phone, but some year or so ago they abandoned the project. As far as I know, Fairphone is the only supplier who creates these type of modular phones. They also make deals with eg gold mines to prevent child labour and so on. The Chinese factories they us they do not allow the personal to work to many overtime hours. Ie they try to make the world a little bit better. Great goals they have and execute upon, at least that is my honest opinion :)

Online/Steemit: Knowing everything will cause an overload, especially now a lot more authors and posts are working with and entering the system. I recently discovered a curation tool that is under further development and the developer is open for suggestions. That maybe something for you? i like to see posts filtering based on keywords, no idea if this guy want to do it. If you like, check my feed, I just posted on it.

Your Challenges I wish you great success with picking up the challenges; My advise, one at the time since otherwise it'll be extremely difficult to keep on going and it becomes pretty easy to just forget about all of them. I speak from own experiences, many of them :)