[myowncrapulence]

Instead of simply using bitcoin (internet), these companies all created arbitrary currencies (intranet) to essentially generate profit for themselves. Having seen dozens of literally identical projects I can promise you all of these "networks" which utilize their own arbitrary currency are scams.

[sneak]

The "altcoin == scam" assertion doesn't hold up under scrutiny.

Bitcoin is IPv4. There is lots of research into the next, better version.