Wireless bandwidth is limited by the allocated spectrum. With landlines, you can always drag more fiber or copper, hook it up, and expand your bandwidth. You can't do that with wireless.
No, but you can:
This is how wireless carriers increase bandwidth. There's considerably more bandwidth available, per square mile, in a city than in a rural area. Not because they have more spectrum in the city. But because each tower services a smaller cell.
It's slightly more complicated than that; adjacent towers need to use non-overlapping spectrum, permits, backhaul connectivity, power. Yeah, it's expensive. Of course, it's expensive to drag more fiber or copper, too.
I've commented multiple times about hydraulic hybrids. I like them, relative to electric hybrids, because they have a very high power density. I like the acceleration that power brings. And 1,000 charge/discharge cycles is hard on batteries but pretty much a normal day for hydraulics.
When you go to fill up your car, you have a choice of where to fill the tank. All too often, all of the gas stations in an area have the same price. Or if one is slightly cheaper than another, there's some other factor that "evens" them out.
The problem with modern email systems is that the emails are stored in plaintext. Some systems may use site-wide public/private key encryption but, if a third party gets access to the site's private key, everything is, effectively, plaintext.
So how do we fix this?
Do all encryption/decryption on the client. The client holds the private keys. The server has everyone's public keys. All traffic and stored data is, by default, encrypted.
More specifically:
Intel CPUs are not defective, they just act that way. -- Henry Spencer