Very uncommon. I would wager fiber is more common than DSL.
DSL has a relatively limited range compared to cable, and the US is more rural/suburban than Europe. So ISPs put more effort into cable. Economy of scale meant that cable won out over DSL. If 80% of your customers need cable in order to achieve acceptable performance, and 20% of your customers will be better off with DSL but cable still works fine, the ISP is just going to ship 100% cable.
With the ubiquitousness of bundled cable TV/cable internet/cable telephone, (which is VOIP that looks like POTS to the average consumer) a lot of the actual POTS providers started switching over to the cable business model. Resulting in even less investment in the DSL technology stack. It's basically dead.
DSL has a relatively limited range compared to cable, and the US is more rural/suburban than Europe. So ISPs put more effort into cable. Economy of scale meant that cable won out over DSL. If 80% of your customers need cable in order to achieve acceptable performance, and 20% of your customers will be better off with DSL but cable still works fine, the ISP is just going to ship 100% cable.
With the ubiquitousness of bundled cable TV/cable internet/cable telephone, (which is VOIP that looks like POTS to the average consumer) a lot of the actual POTS providers started switching over to the cable business model. Resulting in even less investment in the DSL technology stack. It's basically dead.