She said 'we must protect MC from the other love eaters' but doesn't mean there wouldn't be wouldn't be an underlying implication of "because i want to eat him for myself" and a 'rich oujo-sama' like her would have enoughconnections to be protected from being 'hunted' herself
(but considering 'herbivore men' are a term as well as there just being gay/ace ppl, as far as supernatural creatures are concerned, being entangled/encountering a love eater prolly isn't as much of a 'death sentence' as some ghoul that'll spirit you away behind a dark alley lol. I do wonder if male love eaters were a thing, i can imagine some ppl purposefully seeking them out like "take away my love emotions i don't wanna deal with relationship bs in the future" but i don't think there's gonna be that much expansive world building versus focusing on this main chara, unless the author gets popular enough to do another series set in this same 'world/universe' )