Smart lock keeps my phone unlocked way, WAY farther from my home than it should. I'm talking kilometers rather than 100m. In fact, I'm not sure it locked it at all until I did it manually. Surely that's not how it's supposed to work? It should lock automatically once you're out of a trusted zone, right?
That is why it makes no sense at all (well, w1ck3dn1nj4 nailed it, makes google sense) having location instead of wifi trusted sites. I am sure it is not reliable at all, and 100m is way too much , unless you are rich and live in Versailles palace or a similar place