No. First mover advantage is just that strong. How are the competitors to whatsapp or facebook doing? At best you have something like tiktok, which might be technically "social" media but is a totally different segment. You don't catch up with old high school buddies on tiktok, for instance.
All of the examples you gave, the challengers had some revolutionary idea/improvement on top. Tiktok had its recommendation algorithm and short videos. Google had pagerank. That's also the reason why whatsapp hasn't been supplanted. There's no room for innovation (or nobody bothered trying). The same is true for digital distribution. Every steam competitor is basically "steam but [publisher]" or in epic's case, "steam but with steam games".
