Thanks. Traffic is completely free of cost.
Our website is 100% static and based on cloudflare pages. Everything there is cheap/free since as an OSS company we need to keep margins very low. The CI process generates the authoritative information for every merge to master and then the static site is regenerated with a specific set of data.
However, the CI cost is big. Github pins our current cost at over 11k USD. Luckily because we're open source this is all free at the time of this writing.