Is it enabled by default on customer equipment?

On their leased hardware, it is enabled from what I've seen. And if you are running your own modem and router, you will get IPv6 if you configure your setup to request it (via DHCP). They will even give you a /60 if your DHCP client asks for it.

Even? /60 should be the minimum, even home users usually have a couple subnets (guest networks for example, sometimes one for the router's WAN link) and you want the boundary to be on a nybble boundary

A /60 network consists of 295,147,905,179,352,825,856 addresses. I think most users will probably be fine with that.

This is v6; nobody counts individual IPs, because the answer is always "enough".

A /60 is only 16 /64s (i.e. 16 subnets), and that's not always enough.

Yeah, it's not always, but for most home networks it probably is. Ideally they'd give you a /56 or even a /48, but giving those on request and a /60 by default is fine.

Wait, can you not subnet IPv6 smaller than /64?

Not if you want SLAAC to work, no.

Weak, here in Sweden I get a /56 from my ISP. You'll run out of IP addresses long before I do!

When I had Comcast about 5 years ago it was enabled by default.