Good points! paperboat.website is very simple and focuses on friends sharing their blog posts which each other, which helps limit regular users' exposure to potential malicious activity.

I expect it's going to be tricky if the user base grows but I'm not planning to compete with larger social networks. It's primarily a space to create personal sites and blogs and my plan is to keep it around as long as possible. If users decide to purchase memberships, I'll have even more time to make sure it stays secure and up to date. If not, I'll still run this for me and my friends which is a huge motivation for me already.