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Many comercial products always had the source available.

For example, usually with the professional version of compilers the source code was also there, just not on the student/hobby versions.

Just recently I got hold of an old Turbo Pascal 5.5. brochure where Borland explicitly referred the availability of the source code on it.

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Yes, and later on the entire Delphi ecosystem frowned on not making the source code to third party components available in at least some form, so most did. Borland originally set the stage for this by including the source code to the entire RTL/VCL in Delphi, which continues to this day.

That model is not Open Source but Source Licensing because you are paying a royalty (or the complete suite) to access the source code so it's not open to everyone.

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