There's two levels to my gripe with them.

1 - they only allow heart reactions inside their ap. Ok, fine, design choice. A bad one imo, but ok.

2 - they ONLY count heart emojis in the stats of a post. you get notifications for custom ones, but those are fleeting and DO NOT show on a post. Isn't that weird? Why would that be a design choice...I wonder? Couldn't possibly be to subtly silo users, that's crazy to think.