In practice, it’s nowhere near this simple. Even if a platform has “unlimited” capacity to store and serve content, the real estate available in places to advertise/surface this content (homepage, suggested/related content, etc.) is finite and generally tiny by comparison. So right off the bat you have a nontrivial task here to solve that will involve bias, algorithms to determine why a piece of content should be shown over another, etc. And that's just the beginning.
The bigger, more abstract, more difficult task is implementing the above as well as all other aspects of the platform in such a way that it fosters the sort of community you are envisioning, attracts the sort of user you're building for, and this is incredibly nuanced. If you want the platform to appeal to, say, creators of animated or short narrative content who are interested in friendly conversation and critique, you aren't likely to do this if they visit the platform and find nothing but fringe political content and the perhaps less-than-friendly conversation this may attract.
Ironically, building a platform that appears to be fairly unbiased and balanced that puts the control in the hands of the user generally involves an immense amount of curation and control behind the scenes to achieve this. And similarly, failing to put tons of work into this, opting to let the users decide everything organically, etc., will likely find your platform's content and community dominated by whatever group is able to rally the most like-minded users to join up the fastest. You're at the mercy of the mob, and most likely, you won't enjoy what they've brought with them.
The bigger, more abstract, more difficult task is implementing the above as well as all other aspects of the platform in such a way that it fosters the sort of community you are envisioning, attracts the sort of user you're building for, and this is incredibly nuanced. If you want the platform to appeal to, say, creators of animated or short narrative content who are interested in friendly conversation and critique, you aren't likely to do this if they visit the platform and find nothing but fringe political content and the perhaps less-than-friendly conversation this may attract.
Ironically, building a platform that appears to be fairly unbiased and balanced that puts the control in the hands of the user generally involves an immense amount of curation and control behind the scenes to achieve this. And similarly, failing to put tons of work into this, opting to let the users decide everything organically, etc., will likely find your platform's content and community dominated by whatever group is able to rally the most like-minded users to join up the fastest. You're at the mercy of the mob, and most likely, you won't enjoy what they've brought with them.