Why are trails missing?

Apologies if this is answered elsewhere.  I only found one such post and it was for a very specific trail.

I've heard such great reviews and recommendations for Gaia.  However I'm planning my first backpacking trip and already finding that it doesn't include trails found on other services.

Specifically I'm looking for trails to Ontario Peak (California).  In both AllTrails and CalTopo there is a trail from Sugarloaf Peak leading to Ontario Peak (from the north).  However, in Gaia there is only a single trail to Ontario Peak coming from the East.

If I were to purchase the premium membership with additional map layers would I find this trail?

Any info, much appreciated.

Thank you!