I think you're thinking of Ethernet standards - not consumer broadband options.
Broadband speeds are not jumping up in 10x increments - that'd be awesome, but it's not. I currently have a 30/2 connection - I don't see it jumping to 300/20 any time soon
However, connections that are not last-mile or long-distance (for our sake, let's say copper) are usually 100/1000, while fiber is used for 1gbps/10gbps
I think you're thinking of Ethernet standards - not consumer broadband options.
The thing is, there is really no technical reason for this to be the case. Google is showing just that with their fine example.
And since we're talking powers of 10, this is a great example from 1977, just so people who for some reason defend things like caps see why it's so stupid to do so for technologies that advance exponentially like Ethernet does:
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