That's a narrative that makes no sense. If a company is profitable, it doesn't "die". If customers like your product and their friends are on your platform, they have no reason to leave to another.

Pardon my ignorance but is that expensive to run a social platform?

Running a social media platform can be very expensive, and it only gets more expensive every day.

Media takes a lot of storage and bandwidth, and you basically have unbounded costs if you want to meet user expectations for posting media.