About Peer-to-Peer bandwidth sharing networks

Hello, people.

These things seem like a Very interesting concept.
Sell your unused internet access time, and Use the same from other people.
Here are the networks that I have looked at so far:
https://packetstream.io/
https://luminati.io/network
https://privatix.io/
http://hola.org/
https://mysterium.network/
https://www.orchid.com/
https://sentinelgroup.io/
https://lethean.io/
https://substratum.net/
Have any of you used one or more of these?
Know of any other similar networks?
Evaluations? Recommendations? Criticisms?

I personally think it's a very bad idea. Next thing you know you get the FBI knocking on your door because your IP did some shady things. Not to mention these services are a rip off. With PacketStream you get $10 for 100GB of used bandwidth. If you get the wrong kind of people using it your Internet connection will get fucked unless you've got a dynamic IP address but then your ISP might notice and you may end up with more problems than money.