Things like storing VODs (videos of past streams), community tooling, etc., are hard and EXPENSIVE. The developers have a very hard path ahead of them.
The tech behind 9 out of 10 tech startups is relatively trivial to clone. The part that's really hard to copy successfully is the people.
It's also worth noting that if you can't do the people bit then even the most brilliant, un-cloneable tech is likely to fail. It's very hard to get customers if people don't like you as a person.
But hey, that's what co-founders are for.