The US has allowed people to use their own modem for as long as I can remember, certainly back before VM even released the SH1.
There was a new law in 2020 that forbid them for charging modem rental fees on a modem you own (
https://www.engadget.com/tvpa-bans-i...213955005.html ) but prior to this people were still able to use their own.
Back in 2012 the replies here were discussing it:
https://superuser.com/questions/4444...ernet-provider
It's not something that's only appeared over there since the TVPA act came in.