From your message history, it's clear that you've been shopping for a PowerPC Mac to use for web tasks for a bit now. It's time to stop. There are people who make it work, but then they have to do such massive workarounds to get some sites to work, or just write off others that I can't imagine buying any one of these machines specifically to run a web browser.
That's actually been the hard problem killing a lot of the usefulness of these Macs to the general public, ever since Chromium and Firefox started using Rust. You revived a thread about using a Raspberry Pi as a proxy to have working web browsing, which is fine and all, but when you don't already have the old Mac, you might as well buy a Pi specifically to browse the web. At that point, why not get the Pi to browse the internet? It'd run better and faster. You wouldn't need workarounds to check your email, for example. Yes, in 2023, even email is a struggle for these old machines, as protocols and webmail clients have passed them on.
There is no G5 able to do what you want. If you get one for this particular task, you will be disappointed. You are asking for a challenge, and one that even, if you do everything, you will need to shape your web usage around the hardware you buy, which defeats the purpose of a machine specifically for internet use.
That said, I personally love having a G4 MDD for retro gaming. I'm also really lucky it came with a rebuilt power supply, because that is the pain point on those. That's the other side of why people are telling you no. You are asking about hardware with almost no support that is dying of old age.
What can be improved on this idea?
Honestly? Stop having it. I'm not kidding. If internet is what you want a PowerMac for, just, please stop. Don't let there be a part 3.