I published and uploaded a Site for a customer, and a few days later their Webmaster called me up and wanted to know “what all those strange JS & CSS files” on the server were used for.
So after some testing I found out the following:
If I add a 3rd party Bric to a page, and then delete it at some later date, Blocs still publishes the JS & CSS files for the 3rd party Bric, even though it is not used anymore in the project.
Furthermore, the linked references to the 3rd party Bric are still written in the source code.
So if you like to experiment or try out a 3rd party Bric, just bear in mind that the code is there forever. Once you add something you can’t go back.