It provides plausible deniability. It wasn't me, it was Hola.
The issue is there's no informed consent. Outside of /r/netsec, /r/techsupport and HN etc, there probably aren't people who know how Hola works and what the implications are.
You can bet the majority of Hola users don't know what a MITM attack is. I'd wager more than half wouldn't know what a bot net is, or what an exit node is.
I'm not sure that plausible deniability has much value if, say, a user's ISP has a policy of suspending accounts that attract too many complaints about copyright, hacking, spam, etc. The account itself is a nuisance to them, regardless of whose fault it is.
The issue is there's no informed consent. Outside of /r/netsec, /r/techsupport and HN etc, there probably aren't people who know how Hola works and what the implications are.
You can bet the majority of Hola users don't know what a MITM attack is. I'd wager more than half wouldn't know what a bot net is, or what an exit node is.
Most Hola users have not given informed consent.