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Look at what Saint Helena is going through. They're kicking in a bunch of extra bucks so that their island is a landing point for a cable under construction, but the minimum spend is for a 200gbi/s connection.

https://spacenews.com/st-helena-looks-to-unlikely-patron-to-...

200 Gbps is 30Mbps for each resident.

In practice a lot more since people don’t use their full connection 100% of the time.

Except that you need to support peak demand, not average demand.

The preponderance of interconnects is a necessary but insufficient condition for good internet. A good number of those lines will be allocated as dedicated circuit, private dedicated lines, and other purposes.

Speculation, but I would guess no. Having good service means you need an ISP that provides last mile service. You can't just directly plug into the undersea cables, and I doubt the places you listed have good ISPs

Also understated is that they are essentially transit points, so the bulk of bandwidth is dedicated to bigger places (more Asia-America and less in between).