That's essentially what Docker containers have done to server-side applications. Every application is isolated from the host in a container and bundled with only the dependencies it needs. The only shared component is the kernel and anything you mount into it from the host.
Possibly part of the reason that other manufacturers did join the programme is that they thought it would help them sell more of their PCs. That was unlikely to be the case with Apple, who had their own marketing and didn't need a sticker to sell a laptop.
In-store Wi-Fi is very common here (UK), and sometimes the only way to get a data connection because mobile signals can't penetrate the building. Only way around it at that point is a to use a VPN over their Wi-Fi if you can.
Instagram does rat out your likes, comments and follows. Check the "Following" tab on the notifications view to see them for those you're following.
It's just down to chance whether the people following you see it, based on how many they're following and how much recent activity there has been with their followings.
The blank vans, oftentimes actually rental vans, are actually Amazon Logistics. This is Amazon's own delivery operation in the UK, and all Prime deliveries in my area use this service. It's been years since I have seen any third party delivery providers for Amazon orders.
I started a recent flight from LHR to SFO in DUB and saved about £1000 in business class. The flight actually went DUB-LHR-SFO so you end up going back to where you started, but it worked out significantly cheaper!