What you're talking about is supposed anonymity in obfuscation, and that has been proven to not work.
if it's been proven not to work, then neither I2P nor VPN is worth using, no?
most VPN companies keep logs and can be subpoenaed.
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.
I mean, you could similarly reason that bisexuals aren't welcome (both gays and lesbians are solely attracted to the same sex, after all), or that asexuals aren't welcome (you can be asexual and heteroromantic, after all), and so on. I think, ultimately, that unity between us is important, and allowing the umbrella to protect all members of gender, romantic, and sexual minorities strengthens the overall cause rather than weakening it.