In my experience most people think of open source as free plus source available. The average user doesn’t care much beyond that, which is supported by people’s willingness to add just about any dep to their software without validating licenses. No one will ever agree on terminology, but for me personally BSL is in the same category as GPL in that it achieves a bunch of the core principles, has less consequence, but also only works for certain types of software (eg sentry not libcurl).