I really enjoyed Be back in the day and made an attempt to use it as my primary operating system. Two months later, my internet provider stopped giving me lease

I really enjoyed Be back in the day and made an attempt to use it as my primary operating system. Two months later, my internet provider stopped giving me leases for it. I put it behind a router that would give the BeOS computer a lease. When I cloned the MAC of the computer it refused to give me an address. I got so curious I put another NIC in and tried without the router. Soon thereafter it was also banned. The ISP was banning my NIC if I was running Be. To this day I have no idea what happened. It was also interesting to note that the router's MAC was not banned when a computer running Be was behind it.