Interesting, I've always just thought Speedtest just shows incorrect speed for capped, I didn't realise they were the max speed. Still misleading though users are thinking they get those speeds
I tested on my dtac unlimited speed
Speedtest 41.3
testmy.net 39.3
so sounds about right showing max
AIS 10mbps sim
Speedtest 55.2
testmy.net 9.7
55 looks a little high