Comment by ants_everywhere

It's less about bare privacy and more about the fact that it's a closed loop system.

Meta collects your data and advertisers can indirectly use that data to serve you ads. In addition, government actors can use Meta's advertising tools to spread propaganda.

But TikTok is an all-in-one solution. The government have direct control over the algorithm in addition to having access to all of the data. They don't have to go through a third party intermediary like Meta and aren't only limited by a public advertising API.