The “platform” thing is all semantics really, but I do think it’s an important distinction. Every company can’t be a platform. Having an API doesn’t make you a platform, nor does having tech partners or a bunch of integrations to third-party products. It just means you’re participating in the modern API economy, like basically every other SaaS company out there. And that’s fine and you can still build a massive company if that’s true.
I like the definition Bill Gates uses: " A platform is when the economic value of everybody that uses it, exceeds the value of the company that creates it." (more here)