A software analogy:

Someone designs a compiler, makes it open source. Make an open runtime for it. ‘Obtain’ some source code with unclear license. Compiles it with the compiler and releases the compiled byte code that can run with the runtime on free OS. Do you call the program open source? Definitely it is more open than something that requires proprietary inside use only compiler and closed runtine and sometimes you can’t access even the binary; it runs on their servers. It depends on perspective.

ps: the compiler takes ages and costs mils in hardware.

edit: typo

Why your screenshot looks more beautiful than usual greentexts?

edit: is it a custom font?

most honest privacy policy.