The 'don't like it, don't buy it' sentiment appears shortsighted, especially considering that both Android and iOS are operated by two major corporations.
Think of banking apps, for example. Banks usually do not favor a tampered OS.
Consider:
False Sense of Security: A Study on the Effectivity of
Jailbreak Detection in Banking Apps
https://ieeexplore.ieee.org/document/8806743PS: Yes, you might use another OS, but how would you do your online banking with it? Explain.
Another point to your "don't like it, don't buy it"-argument:
Suppose you buy a device; further suppose the state is not involved (no warranty). Your device breaks down the moment you bought it, and there is no refund. How do you deal with that, especially if you are low income?