Both of them have their pros and cons. It's a matter of sacrificing convenience or security.
I2P is surely a go to for me over Tor/VPN when it comes to anonymity. You will come across variety of information which is not available on clearnet/tor, but clearnet has the upper hand in abundance.
You can find plenty of versions on Demonoid https://www.dnoid.to/. I've used them on bare metal and on virtualization.
I just checked my DNS blocked list. Topaz software do download their models from their repositories, but I haven't come across any issues. About safety, well, its upto your threat model.
WhatsApp was build upon XMPP protocol. You can look into XMPP clients.
Besides that WhatsApp is not the way to communicate anyway. Normies use it because it is put up on their face and considered to be widely acceptable among them, while rhey don't understand how privacy invading it is.
Technically NFT, a token is linked/owned by a wallet address. Which you cannot pirate/dublicate.
But in case of nft images, those tokens are linked to an image on ipfs through dapps, which you can download. But there is legal uncertainty about these images.
Both of them have their pros and cons. It's a matter of sacrificing convenience or security. I2P is surely a go to for me over Tor/VPN when it comes to anonymity. You will come across variety of information which is not available on clearnet/tor, but clearnet has the upper hand in abundance.