in Germany Vodafone deployed DOCSIS 3.1 partially and while still not symmetric i get 100Mbit/s down and 50Mbit/s up more or less consistently with DOCSIS 3.0 where i live unless something goes wrong (it does sometimes interfere with LTE here). DOCSIS 3.1 is also available with lots of [0]channels using the newer 1024QAM. they offer up to 1Gbit downstream and 50Mbit upstream for about 70€ a month. i also made a [1]screenshot of the channel usage and stats page of the modems web interface.
It's not required to have DOCSIS 3.1 to have 100Mbit/s symmetry, 3.0 can provide that.
Vodafone in Spain has a mixture of HFC footprint (the widest), its own small FTTH footprint, and Telefonica (Spain's DTAG) wholesale FTTH. Prices and speeds for the three of them are the same, but if you are on an FTTH zone you get symmetric upload speeds, while on HFC zones they provide 100Mbit/s upload with all their plans (min download is also 100MBit/s).
They argue they will be able to have symmetry on 1Gbit on HFC when they complete their DOCSIS 3.1 rollout, but that has been going on for years with no news. Ironically their own FTTH footprint is pretty small so they end up, in most cases, providing better upload speeds when reselling Telefonica infrastructure than with their own.
Thats approximately what is offered in the US as well. The reason that 100/50 seems close to symmetric is because the 100 is low. The fact that it’s still only 50 up with the 1 gig downstream suggests that they have the same constraints as cable ISPs in NA.
[0] https://helpdesk.vodafonekabelforum.de/sendb/belegung-11.htm...
[1] https://gist.github.com/mercora/ef66f5bcd95b060ac25269b17cc6...