I don't know if "reliable" is a good word for the legacy banking system. The banks in Cyprus for example siezed money from peoples accounts only a few years ago... its much harder for banks to seize bitcoin that you self-custody. Many wealthy people and now companies are beginning to view bitcoin as a safe haven asset because of its decentralized security model and censorship/seizure resistant properties.

https://en.wikipedia.org/wiki/2012%E2%80%932013_Cypriot_fina...