Magic Johnson doesn't need IG. Social media would not increase the access he has to hot women, it would only lead to his personal affairs getting publicized. Remember the D list pornstar who posted pictures of Zion Williamson sleeping in bed, along with screenshots of Cashapp payments he made to her? If some woman wanted to do that to Magic in the 80's she'd have to bring a big-ass video camera and video tape him handing $1k in cash to her. Much easier to blackmail or expose a celeb when you have that capability in something that can fit into your purse.
Magic's access to women wouldn't increase with social media because he can already fill up his hotel suite with hot girls DTF on his own. If you can only fit 30 women into your suite, and you can consistently do that yourself, does it matter if social media allows you to reach out to 1,000 women? That's just 970 women that you can't invite because you don't have physical space. Hell, even 30 is too many, you only need 3 - 5 really. A man can only nut in so many pussies in one night before he's satisfied and tired, and wants to send the girls home and go to bed.