It's less of a matter of "I don't want the government to spy on me, the individual with a banal life" than a matter of "I don't want the government to spy on us, a society".

For instance, having a FB account enables FB to spy on non-FB users via shadow account - they will create shadow accounts based on faces they don't recognize in photos, and shadow friend profiles based on numbers stored in my phone.

A more insidious situation is that TikTok enables Bytedance (read: the CCP) to monitor political dissent and potentially shape cultural zeitgeist via content recommendation [1]

Many content recommendation algorithms use some sort of collaborative filtering algorithm, where if the system lacks data on one user's preferences they can infer it given a sufficient number of users with overlapping preferences and attributes [2]. So even though my data and life are not special, it does enable the government to find out more about people they are interested in.

[1] https://www.theguardian.com/technology/2019/sep/25/revealed-... [2] https://en.wikipedia.org/wiki/Collaborative_filtering