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Personal experience.

Was developing OSI applications in 1989, you could order an X.25 circuit from your PTT and run OSI over that using the ISODE [1] toolkit.

The earliest ISP in my country didn't start until 1992.

[1] https://en.wikipedia.org/wiki/ISO_Development_Environment

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TCP/IP was developed in the 1970s and adopted as the protocol standard for ARPANET (the predecessor to the Internet) in 1983.

and commercialization wasnt done until the like 1994. OSI as a successor was still proposed when the first BGP4 rfc came out.

before commercialization happened, IP was mostly the realm of government and education.

I feel like your experience was quite different to mine. I used TCP/IP in the late 80s at university and doing commercial contract work. I remember OSI existing but at the places I worked it was treated as less common.

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