Question about Lyft / Uber - Are they inflating costs on return trips?

Has anyone else noticed this? I'm in Austin, and I help my 2 elderly parents. Dad gave up driving due to age-related macular degeneration -- and I'm really happy he did. We've been using Lyft (and to a lesser degree Uber) for 2+ years and it's been great for giving him mobility and reducing his risk.

But... one thing I've noticed is that if you book a trip, and then book a return trip... the return trip is ALWAYS more expensive than it should be. I think Lyft is deflating "leaving home" and inflating "going home" costs. I assume they are thinking, "Let's make it easy to take the trip, and then once we have you... we'll make up the difference."

Anyway our hack is just to take Uber one way, and Lyft the other. Seems to save a ton of money. Or book from one account one-way, and another for the return.

For example, this morning... Dad had a dental appointment, and the "to the dentist" cost at 7:30 AM was $35. The "return home" cost at 9:45 AM was $105! Crazy since traffic had died own a bit by then.

When I plotted the same course from my app at the same time, it was $32. So I just booked a trip for Dad on my Lyft account. The cost would have been over $70 more if he just "defaulted" to taking a Lyft home from the same account that he used to get to the dentist.

Don't get me wrong, these services are a godsend. But... can't help but feel like some of the shady from Taxi company history remains.

I've only got cursory evidence, but seems to be a trend. When Dad goes somewhere, the return cost is higher. I just have him call me and I book the return on my account. Almost always saves money.