OVH's "unmetered" servers are as "unlimited" as T-Mobile's 4G -- once you use a certain amount of data transfer, you're throttled.
Excerpt from the OVH license agreement:
In the case of a server of the Virtual Private Server range, OVH will guarantee a bandwidth of up to 100 Mbps (one hundred megabits per second) as long as the traffic of the bandwidth does not exceed the pre-defined set monthly volume of 10TB (ten terabytes). This monthly volume includes both internal OVH traffic and traffic outside of the OVH network. When the monthly traffic volume exceeds the set monthly volume, the bandwidth of the Virtual Private Server will be limited to 1 Mbps until the next monthly renewal date.