The Purge Event is a celebration of suicidal vorephiles. It's not sexualized at all, of course, it's still treated like a shameful adult event. We all know two reasons that a form of entertainment is illegal; either because it's obviously destructive, or because the authorities are disgusted by it. And death doesn't exactly matter in this universe so it's still just something done between consenting adults.
Speaking of adulthood. There's an easter egg before purge event where one of the doors will open into the world from
Extinction Party, the episode where all the supporting characters are desperately telling ENA that she's in an inappropriate place, even starting with a someone trying to card her. You think that's about immigration? Hahaha, this show is set in the
internet, and nearly all of "border patrolling" online is there to keep minors away from being exploited or corrupted, exactly what the other two characters are talking about. We have all of the available data to figure out ENA's problem without reading the DSM. She talks, dresses, acts, and mood swings like a teenage girl. And voreaphilia is also a vice that is specific to the internet.
And the Purge Event is the easy way to advance with a steep price to pay later that will most likely lock you out of the Lonely Door's good ending, while denying you of a useful item (the Board Member) for later episodes. It has the kind of consequences that game designers assign to doing a bad, immoral thing. And the doors in the purge event are opened
by hands in the same way that someone holds their clothes or even orifice open, like a subliminal cue that this is a sex thing.