There have been times where I wasn't able to get more than a handful Mbps from an OVH box in RBX to any network I've tried (multiple eyeball networks, Google Cloud, AS204880...). I also know multiple people who had to quickly migrate out of OVH because they suddenly got DSL-tier performance to their critical customers, and there was nothing they could do about it.
So it might be theoretically unmetered, but technically... I'd be surprised if you'd be reliably able to push more than 20TB in a month to outside OVH's AS, or even datacenter. You get what you pay for, and while network connectivity is not nearly as expensive as what large cloud providers would like you to believe, it's not free.
A true unmetered, non-oversubscribed, globally reaching Gbps link would run you something close to $200/mo in T1 transit commitment costs alone, and that's if you buy in bulk and already have good settlement-free peering with large networks to supplement that T1 transit.
How are you using 20TB/month? Are you running a tor relay or something?
There is more to the web than crud.
not really. 90% of people using the cheapest vps are going to host wordpress or crud apps on there, not their video streaming startup that competes with youtube.
But then I realized you are limited in bandwithd to 20 TB, while OVH provides, for barely more €, unmetered traffic. It's huge because you never have to worry about a random spike day, a bot doing something stupid, an attack, or a use case switch (ex: video streaming).