That's what he's saying though? BDO had limited PvP, but free PvP isn't really new especially in faction mmos and you'd only think so if BDO was your first mmo.
WoW, as PvE centric as it was, let you kill anybody that was PvP flagged on the other faction, which was everyone past 25(newbie zones were safezones though, unless people just recalled from a pvp area then you could kill them). See Hillsbrad wars or STV ganking parties. And that shit isn't even all that much if you compare to old FFA systems like they had in AC and EQ, where you could literally attack everyone else that wasn't in your guild. Then a lot of games since wow had free pvp, Rift, Age of Conan, Warhammer, Wildstar etc. Generally, it's korean games that have shitty karma systems for PKing because they don't have pvp/pve separate rulesets so they allow pvp with harsh penalties, like UO did back in the days(well harsher than original penalties, more like Trammel stuff). Even TERA had free pvp, although you did get penalties for killing lowbies but you could kill everyone around your level with no repercussions. Aion too as far as I remember but that was a long time ago.