If syncing is through iCloud, you'd only have to trust Apple and nobody else, if I understand things right. And yes, I trust Apple a thousand times than I'd trust a web hosting company or all the open source projects involved in self hosting.

Self hosting is an unsurpassable mountain for 99% of people who need to use computers. The risk to security and data loss is much higher than from syncing your apps through iCloud or through the app manufacturer.