The reason they have implimented the BW limitation is because their host (OVH) has suddenly started to enforce the limits witch was not the case before this, so most of their servers where over the caps resulting in very slow speeds for a about 2 weeks on most servers. This should be all set now as they have been running the BW monitors on all servers for a while now and can limit individual people now.
Although the 1tb cap seems low it only counts external upload BW. Meaning it does not count download BW or ANY internal BW on the OVH network. To give an example of 2 weeks traffic (they implemented the meters on the last 2 weeks of my plan) i had a upload BW 1.8TB of traffic and nearly 700gb was internal witch is a large portion.
Its a toss up though because the OVH plans that come with the limits like feral use get higher network priority from what i know but i can use up 1tb of external upload rather quickly.