Game Over Paid Out, page-6

I know of no other country or stock exchange where small shareholders have to confirm that they want to remain shareholders, otherwise, a company can buy back their shares for a reasonable price.

It's a really interesting procedure on the ASX for shareholders with holdings valued below $500 and good to save admin costs for companies.
This practice is basically a throwback to the days when everyone received printed documents by mail.

Nowadays, with information sent out by email, this shouldn't be necessary anymore and those with valid email addresses in the share register should be excluded, as they do not bring big costs for companies.

However, anyone can simply tick the box to remain a shareholder if they wish. No big effort.