Choosing a provider because it does good is only sensible if the service itself holds up. Here is a fair comparison, including the places where a large telco is genuinely the better choice.
Is the actual internet different?
Not fundamentally. Almost all Australian providers resell the same NBN infrastructure. Your line and your speed tier are the same physical product regardless of the logo on the bill.
Where does a charitable provider win?
Where the profit goes. Goodwill Connect states 100% of profits go to local charities, and advertises no lock-in contracts and no setup fees, so leaving is not penalised.
Where do the big telcos still win?
Bundling. If you want mobile, streaming subscriptions and internet on one account, or you need a physical shop to walk into, a large telco covers that. They also run larger support operations with longer hours.
What about coverage?
Goodwill Connect operates in Greater Sydney. A national telco will serve you anywhere. If you are outside the service area or likely to move interstate, that matters.
Is a smaller provider riskier?
The honest answer is that any smaller provider carries more concentration risk than a national one. No lock-in contracts cuts both ways here: it also means you are not trapped if it does not suit.
How should I actually decide?
Check availability at your address, compare the plan you would take against your current bill, and decide whether the difference, if there is one, is worth what the margin funds.
Check your address and current plans at Goodwill Connect. Figures and claims here are the provider's own published statements; compare against your current bill before switching.