[Youden]

In Switzerland other fiber providers (such as Init7) have a dedicated physical fiber strand to your premises and a dedicated 1Gbit port on the other side.

Salt uses 10G-PON, which as I understand it splits a single 10Gbit port. Salt's configured to split it 64 ways.

It's possible other providers are oversubscribed upstream but I haven't personally experienced any congestion issues with Init7, even over long distances (e.g. Zurich to Fremont, CA).

[Havoc]

All ISPs are at the edge of being oversubscribed. If not they're either commercially incompetent or in the hype stage of a marketing cycle (omg check this ISP I can download 24/7 at full speed)