Well, it depends on what you want to do. When I was searching for Bitcoin wallets, I hit bitcoin.org and then found out about electrum. When you've heard that Binance is a great, secure, user-friendly wallet and they sell every shitcoin, you'll be disorientated.
You know "bitcoin.org" exists, a newcomer may not. They usually use google or see the advertisement somewhere on the internet, maybe while watching a video or surfing some website.
This is also the reason why there are so many phishing victims and also why Google and Youtube briefly banned cryptocurrency related ads, although not all of them.
Correct, but I was wondering; if you don't know the source code of a wallet software, how can you know that it isn't being on someone's custody?
When you have access to your private keys and control them, you know that it is not in someone else's custody but what you don't know is that if someone else
also has access.
In contrast in a custodial wallet you have zero access to your keys and give up full control.