Far from flawless. They did it to me and it was dropping half of DNS requests I was receiving so my websites were down. And you practically have to beg them to take you out of DDoS protection.
This doesn't seem unreasonable, OVH is not advertising DDOS protection (nor do they seem to be structured to offer it). Some hosts will can your VM and throw out its data, which is a much worse outcome.
Good practice, actually, but it's something people usually get frustrated with and they're literally famous for doing it.