The saying goes if you’re not the customer, you’re the product. Now, you’re both. Every big social media app is testing subscriptions. It's a business model that comes with a perverse incentive. Just like airlines, if you make life worse, more people will pay.
But you are still socializing with us despite not knowing our real names, so this and Reddit would definitely qualify as social platforms. Twitter was also mostly anonymous for its 16 years prior to Elon, and it has definitely always been considered social media.