No, there are places dedicated to preserving and making available heirloom seeds.

Southern Exposure Seed Exchange: https://www.southernexposure.com/

Seed Savers Exchange https://www.seedsavers.org/

Open Source Seed Initiative partners with multiple seed exchanges: https://osseeds.org/

Is there a market for good tasting tomato seeds? :D

It's actually fascinating - I remember my grandmother scooping out the seeds out of vegetables and drying them, to be used next year.

The villagers also traded them as apparently they had different varieties.