Questions like this suggest that 1&1 do: https://forum.openwrt.org/t/solved-dsl-over-ds-lite-with-isp...
I'm less sure about Telekom. For obvious reasons, it's hard to find info in English.
My anecdata is that I'm on 1&1 fiber and I have a public IPv4 address.
My anecdata is that I'm on 1&1 fiber and I have a public IPv4 address.