This is something that actually drives me a way from using "a thing" - that some team post something "open source" - but in reality it's a product and there's a pricing tab on the website.
I think we've overloaded the term for sure. I'd prefer honesty - "hey we have a new product/service/platform! We've opened up our customer tooling source code and made it free and available for anyone to contribute too"
To me releasing open-source to specifically try get people to sign up to a paid product is a sales tool.