[notyourwork]

Some do, I just setup a ubiquiti amplifi which has guest WiFi feature.

[Karunamon]

MikroTik can do this as well, though in typical fashion for them, it takes a bit of work to set up.

[davefp]

Guest WiFi usually uses a captive portal, I think. I don't think that would work with something like Google Home, which expects to have internet access right away AFAIK