一个冷知识，ios的app store里所有软件都是收费的，只不过一些软件定价为0。
价格为0和免费是两个不同概念，体现了ios对app store的定位，也在隐私方面有不同的差别。
比如，ios里下载的任意软件均无法彻底删除，都会体现在购买记录中。
A cold knowledge is that all the software in the ios app store is charged, but some software is priced at 0.
The price of 0 and free are two different concepts, which reflect the positioning of ios for the app store, and also have different differences in terms of privacy.
For example, any software downloaded in ios cannot be completely deleted, which will be reflected in the purchase record.
#fuck Apple