1) Static CDNs
We live in a wonderful time where CDNs are essentially free for small projects. I use CloudFlare for almost everything, simply because it’s so easy to set up, it gives you a free SSL endpoint, it allows you to use naked domain names (faviconkit.com instead of www.faviconkit.com) and it just works well. The HTML is hosted on Github Pages, which is also free.
1a) Number of edge servers
CloudFlare: 151 https://www.cloudflare.com/network/ CloudFront: 117 https://aws.amazon.com/cloudfront/details/ KeyCDN: 30+ https://www.keycdn.com/global-cdn Google Cloud CDN: 90+ https://cloud.google.com/cdn/
There are a few unique aspects of Favicon Kit specifically - the setup here is a tiny little bit more "sophisticated", which is why I chose Key CDN for the API itself.
2) Money spent on infrastructure (at least in the beginning)
+ Favicon Kit used to run on Heroku until recently, so I spent a few bucks on their hosting and CI plan. (It now runs on AWS Lambda) + I have a paid Github account. + CloudFlare is free. + KeyCDN so far cost me < 100€