They are trying to stop what they call growth hacking through excessive engagement, but I didn't think Barry was excessive, and he certainly never asked for anything in return. Some read and it's conditional - they demand you read them back. Barry wasn't like that. I could be a completely useless friend, go on holiday, and not swing by his stories for weeks, and he was fine about it. He wasn't doing it for the read backs or he'd have given up on me long ago. He was doing it because he wanted to.