Juniper has been moving out of FreeBSD for quite a while. See the link for some datail https://www.juniper.net/documentation/us/en/software/junos/o...
So GPL is not a problem for Juniper after all.
But even before that RE-S-2X00x6 cards were running FreeBSD on top of Linux KVM.
So no, network hardware vendors are not choosing BSD, not at all.
The sale person needs to talk to the Corp Legal IP team.