Those exemptions only apply to VPO's that reimburse pilots for expenses. If the pilot is not reimbursed for expenses, no exemption is necessary.
And FAA has claimed and won numerous times stating that flight time in a logbook is remuneration.
Doesn't matter if I pay for the gas. If I get anything else out of the flight, even "future goodwill", and had no common purpose to go there in the first place, I'm screwed. See Mangiamele.
But we are talking about the safety concepts and pilot skill set and mechanical maintenance requirements, not the remuneration. The examples given aren't all non-profit. See gliders.
If there's loopholes galore that allow Private rated pilots to do all sorts of things that typically a Commercial rated pilot and aircraft would need to do, that they couldn't do without all the loopholes, there must not be as much concern for those loophole organization's passengers, as for passengers of a ride sharing system. Logically anyway.
It's really not possible to argue it both ways. But they do. It's quite entertaining from a purely logical standpoint.
Only 100 hours and some basic hand signal training? Hop in and tow this glider up. FAA says it's cool. Even pulling a non-pilot paying passenger in the glider back there.
Meet whatever numbers CAP says is cool for a Form 5? You're good to go to load up the Senator and show him the fire burn area. We'll send some kids over in a minute for their O-rides, too. It's cool.
Be a benevolent organization that'll schedule flights for the general public as long as they need to get to a hospital? No problem! Just fill out this website form and we'll recommend some mildly higher standards that aren't that significant. Certainly not 135 Commercial standards.
Schedule ten pilots to give rides to children they've never met at YE rally? Go for it.
But...
A website for scheduling general flights given to the public at half the operating cost of the aircraft?!
"Oh my GOD man! It doesn't meet the Commercial STANDARDS! Think of the children!!!"
(Oh wait. We already allow lots of children to be put at the same risk... Hmm.)
Ok, think of the danger to the houses below!!!
(Oh wait, we already allow that too...)
Then think of the terrible and horrible dangers possible to consenting adults who don't know you're only a Private Pilot!!!
(Oh wait, as long as you both had a reason to go there and it won't generate any "goodwill" from your passenger, we even allow that...)
Then think of the possible dangers if you do it in a homebuilt airplane!!!
(Oh, we allow that too? There's a big sign that says EXPERIMENTAL when they get in? Well crap...!)
Okay... You're "holding out".
(Wait, there's a website with a schedule for most of the above?)
Okay the airplanes must be maintained to a higher standard!
(Wait, we don't make any of them do that either?)
Heh heh.
I'm pretty much expecting the next step is a guy walks out with stripes on and says via his mic on his belt... For as arbitrary and different as all of the various loopholes are...
"Encroachment. Toward the airlines. Fifteen yard penalty. Automatic, first down!"