I have no idea why every news article on this matter makes it sound like everyone should be against these changes

Broadly speaking: because news corporations aren’t owned by normal people. Reporting this kind of (mild, but nonetheless real) attack on the most wealthy in a positive light is a sure way to get censored and disciplined by the company.

Quoting the print and digital media section of GetUp’s media diversity report (2021):

• News Corp is the dominant owner of Australian print and digital media, controlling 59% of metropolitan and national readership — up from 25% in 1984
• Nine is the second-largest media owner with a combined 23% readership share. Seven West Media Limited has 15% of the market by readership (eureka’s note: 59+23+15 = 97%)
• News Corp now controls the majority of local and regional newspaper titles in Australia

It doesn’t take much digging into these three companies’ major stakeholders to find key people with net worth in the billions. And unless you’re going out of your way to avoid them, most news articles you’ll see are controlled by this upper owning class through various filters (incl. board selection of executives, editorial policy, advertiser pressure).