Now that Docker has become paid and is only free for 250 or less users, can the Shiny App deployment using ShinyProxy service be considered a free and open-source solution. I am planning to deploy a Shiny Dashboard for over 2000 customers each running their own instance / container to view their Dashboard.
The changes made by Docker Inc only affect the Docker Desktop offering. This tool makes it possible to run Docker on Windows and macos. Therefore, this limitation only applies when using ShinyProxy on Windows or Macos. On Windows you can still run docker in WSL without limitations.
In most cases ShinyProxy is deployed on a Linux server and then there is no limitation at all. Similarly, when using ShinyProxy with Kubernetes, there is no limitation (in that case you even can use a different runtime instead of Docker).