From a Mashable article published at the time, quoting the CEO in his own words:
In an interview, Prince expressed doubt about his decision to remove The Daily Stormer from Cloudflare, and conveyed concern over companies like his own, and their ability to pull a lever, and knock a website offline.
Getting a decent VPS is pretty cheap. Email is the enormous problem. Even if your VPS provider allows outgoing email, your IP address will be flagged and blocked by all mailservers everywhere for the crime of not being Google or Microsoft, or not having a full-time person working 24/7 to satisfy the people in charge of blacklists. You can pay someone else to send your email, but that’s going to cost you as much or more as the VPS you’re using to host your entire app.