Why it doesn't make sense for streaming services to have a "+" in their names

Gizmodo

"No more +," she says. "Stop. May I suggest the word 'Pro' or 'Premium' or just naming your streaming service some simple and intuitive? May I present the deeply unsexily named Amazon Prime Video? Simple, no + in sight and I implicitly understand that if I pay for Amazon Prime, I get some video streaming channel as well. And even if I didn’t, I got 10,000 emails from Amazon in my spam folder explaining it."