News: CGC Costa Group Says Shareholders Vote In Favour Of Scheme, page-3

One share = one vote.

The word "public" does not mean a voting system based on one vote per shareholder. It means that shares may be acquired through a public exchange, by individuals or companies who have the resources to acquire them.

So larger shareholders (who hold more shares) have higher weight than smaller shareholders (who hold less shares).

That's within the current rules. As to whether it is fair or not, it certainly can disadvantage smaller shareholders - which has happened in this case.