In a game where I had Crystal barricade on the field giving me the player Hexproof, other player plays overwhelming splendor which states “enchant player

Enchanted players creatures lose all ability’s and have base power and toughness 1/1

Crystal barricade provides a static(passive) ability stating “you have hexproof” (you can’t be the target of spells or abilities your opponents control.

Now as an Aura enchantment per rule
CR 303.4
“An Aura spell requires a target, which is defined by its enchant ability.”

And rule
CR 702.11b
“A player with hexproof can’t be the target of spells or abilities an opponent controls.”

Meaning pure rule 303.4 an aura targets and rule 702.11b hexproof means I can’t be targeted so Arena allowed the card to bypass Hexproof illegally and the spell lacking a target should have either fizzled or had to have targeted the caster.

I am on IOS but I do not know what the other player was on not that it matters as it’s an error in how arena handles the rules logic of cards.