Jstor is an information database provider that that specializes in the republication of academic journal articles. The web is the company's delivery mechanism, not the defining trait of the its existence. A public-facing website doesn't make it anymore of a tech company as such than it would the New York Times.

NYT is more of a tech company than you might think [1] and they've been one for longer than you might think: the de-facto standard profiler for Perl [2], of all things, comes from them.

[1] https://open.nytimes.com/

[2] https://metacpan.org/pod/Devel::NYTProf