I think this is one of the strongest pros for using OVH;
YOU get the abuse letters and as someone operating a internet service it is YOUR responsibility, legal and otherwise, to deal with them.
This means if the abuse letters are ignored, the next step is the legal one instead of having OVH deal with it. It's business between you and the hoster, not between you and OVH.
Unfortunately, the legal process has not caught up with the speed in which malicious actors can conduct their attacks. In some cases, infrastructure is used for merely a few hours before swapping to something new. It's a constant game of wack-a-mole and without the provider's help, there's no way to stop it.
YOU get the abuse letters and as someone operating a internet service it is YOUR responsibility, legal and otherwise, to deal with them.
This means if the abuse letters are ignored, the next step is the legal one instead of having OVH deal with it. It's business between you and the hoster, not between you and OVH.