Shows how gold has zero portability. Why should I trust a 3rd party to hold my gold?
You trust a 3rd party to write your Bitcoin client.
No I don't. I can read the code and I am capable of understanding it.
And what percentage of Bitcoin's userbase can understand source code? Even if reading it you need to have a high level of understanding to spot a well obfuscated block of code intended to do something nefarious.
This is relevant how?
You don't
need to trust anybody, but you
can trust somebody. Also by somebody I mean that you have to maintain trust in at least one single person out of every single person that bothered to read the code out of the entire population of people in the entire world, trust that at least one such person would expose a backdoor if there was one.