...and that's just one site. There are free games on Steam, and free games on aggregator sites like Kongregate and its ilk.
If you mean free as in "libre", then sure, there are fewer games. But, frankly, most game code bases I've seen is a complete mess. Might as well just start your own from scratch ;-)
If you mean free as in "gratis", then there are loads of free games available online.
E.g. https://itch.io/games/free (468,224 results)
...and that's just one site. There are free games on Steam, and free games on aggregator sites like Kongregate and its ilk.
If you mean free as in "libre", then sure, there are fewer games. But, frankly, most game code bases I've seen is a complete mess. Might as well just start your own from scratch ;-)