Of course there are many non-verified games that run fine as well.
For comparison, the Switch has somewhere between 5,000 and 10,000 games.
Source: Wikipedia lists about 5000, Nintendo says “over 5000”, but this website claims 10,880. Part of why the Moby Games website lists more is because it lists multiple versions of a game as separate games (Xenoblade DE is listed 4 times for example).
You could say the same about door locks. It’s not going to stop a thief who wants to get in from getting in. So why even have a lock on the door? Because it will prevent nosey people from getting in.
Similarly anticheat won’t prevent anyone dedicated to cheating, but it does prevent the “script kiddies” who would cheat if it was super easy.