Peole choose 'convenience' over the safety of their coins, there was a topic i read here the other day about self custody being more difficult to achieve than third party custody, that is the idea that a lot of people have and so they sleep well because they think the third party service is their safest option in keeping their BTC.

Self custody isn't difficult, the only requirement is responsibility, and just the way only the owner of a property or something can care for it in the best way possible, that is the way only a BTC owner can show full responsibility in keeping their BTC safe, if you give your BTC to a third party service to keep for you, you now have to trust them when you know nothing about them or what is going on behind the scenes, but when you keep it yourself, you are liable to yourself and if your funds are 'dear' to you you'll keep them safe without encountering any problems.