the whole purpose of a VPN is to anonymize internet traffic, so they have many servers that send traffic out to the internet, which improves both anonymity and bandwidth. I2P is more akin to Tor, with anonymizing internet traffic as a bit of an afterthought, and the limited number of internet-connecting nodes makes users’ traffic more trackable.
if it’s been proven not to work, then neither I2P nor VPN is worth using, no?
well, sure, but that’s why anybody looking into a VPN is generally advised to use specific, known-good VPN providers who don’t keep logs and who, preferably, aren’t headquartered in a country with strict IP law.