Why go through the trouble of running a VPN company yourself? That is sooooo 5-10 years ago.
Rolling your own fixes one issue and raises another.
In that way, an ambitious project that gives away certificates that were formerly worth a lot of money would be a pretty slick honeypot because now you could stow away private keys and have a copy of most of the encrypted webs certificates to decrypt in-flight communications.
https://en.m.wikipedia.org/wiki/Certificate_Transparency
The log is like a git hash-chain: you can never erase the past without affecting the whole chain after the erasure.
If you want hidden backdoors, put them in hardware, not software. Chips are the best place.
And even if a VPN company isn't compromised, there are so many legal loopholes that would allow government to access your data. Kitten on a tree can quickly become a matter of national security.