i read that la, note: "may on the recommendation of the commission." & "may specify the minimum or maximum rates"

this 2 lines sums it up, may allows for a lot of leeway, its a loophole if you may.

in other words, post malaysia can charge as much as they want without seeking approval of the minister if no recommendation is given OR the minister sets a price too high.

so a minister can set a price x1000% of current price, post malaysia increases at x400%. no problem
post malaysia can also increase prices by 200% but no recommendation is given, minister cannot act.

i try to say the process of any increasing rates in postal services are like this:

1) pos malaysia recommend new tariff to the ministry
2) ministry will table it in cabinet meeting
3) if approved by the cabinet, then only minister will sign
4) to be gazetted
5) to be implemented

there is no such thing pos malaysia can increase suka hati

by right logic yes, but if you see that act has loop holes, the restricted tariff is only for cheaper rates, but more expensive its up to the ministers consent.  to be fair also, post malaysia can charge as much as they want, break the law, ministry only course of action is frees (i dont see criminal charges), which post malaysia can do a dbkl on.

latter has been done before in very highly regulated industries.

ministry control is a bit different, less red tape