You cannot build a CSAM generator, period. CSAM means Child Sexual Abuse Material -- material created through the sexual abuse of children. If it came out of a generator, it is not, by definition, Child Sexual Abuse Material.
This is an easy fix. Ditch the HOV element and make the lane toll-only. Tolls already encourage carpooling -- more people in the car means less toll per occupant.
Look at the name. I think their goal is that most of the time when you're out and about, you're connected to Wi-Fi. I think the cellular partners are a crutch to get them there. If they manage that, you'll wind up paying a lot less than with T-Mobile.
People think they don't want to pay by the megabyte, so they're calling it something else. Also the plan provides a cap so that you know you're not going to pay more than $X per month without going to some app and adjusting something.
Or better yet, some sort of dynamic pricing when, say, you're on a crowded subway platform. You'd really want solid software integration for that, though, so the user isn't unpleasantly surprised by it.
Also, notice that they're not charging extra for tethering, or care how many devices you tether to. As far as they're concerned, data is data because you're paying for it.
"We refund the data you don't use" is basically a way of saying "you pay by the megabyte for the data you do use" -- which is actually really great, I've been frustrated that everyone's settled on "all-you-can-eat" data as the standard, it doesn't align incentives well at all.
And they really are refunding it: if you use 1.2GB per month, it doesn't matter whether you sign up for 2, 5, or 10GB, your bill comes out exactly the same.
Your data is secured through encryption when we connect you to open Wi-Fi hotspots. It's like your data has a private tunnel to drive through."
So that's a yes
ETA: Of course this does mean Google has the plaintext, but then, your ISP always has the plaintext unless you're bringing your own encryption, so this is really no different.