Key Quote: To be clear, this EULA applies only to Caddy binaries you download; it does not apply to the source code. Caddy is still open source, and the source code is under the same Apache 2.0 license. Doesn't this mean that you can simply compile Caddy from source, and avoid having to pay for commercial use? Most Caddy users are likely going be comfortable with compiling stuff, so what benefits does paying bring be…
Commercial licenses would only cost hundreds of thousands of dollars per year if your organization has at least 160 instances in use. Keep in mind that modifying the source is required to plug in any plugins, which people tend not to want to bother with.
We're also looking into adding more features for our customers.