I've had plenty of girls reach out to me on Instagram, but aside from maybe two, none of them reached out to get with me, they just wanted to be included in the stuff I was doing/posting about. Like if we were given access to the VIP section at an event, or a private club. However, from the girls I brought along, I ended up clicking with a couple of them and hooking up. So I'd say mild success.
Don't buy an account. Buy followers instead, using a service like mediamister.
Re: Alex, it depends what country. TikTok had a flash in the pan in Japan but it's considered boomer tech now. Instagram is where the high-status normies are.