Any project (regardless whether open source or closed source) does rely on developer to enhance the project.
An open source project (e.g. bitcoin) does also rely on developer.

A lot of time has passed since the first version got released. A lot of good tweaks have been done

Where do you think do all of these improvements (e.g. segwit) come from? From independent developer.


There are even more enhancements coming (LN, Schnorr signatures, Coinjoin, ...). All from independend developer.