>>64021535Since everyone else is fucking shitposting instead of telling you, I'll do it.
It's because they want to expand their fanbase, and it's REALLY intimidating for a JOP to watch them when they barely speak any Japanese. Handing out likes to random JOPs who start watching them is a very nice way to ensure they'll stick around and attempt to learn some eigo for their new adorable oshis.
This is also why they're quick to respond to random JP "HELLO/GOOD MORNING!" live chats.