cause 表示理由的时候，不加冠词，最常见的搭配有：

be/give cause for concern/celebration/ alarm

表达某个东西让我们喜忧参半：

give cause for both hope and worry

翻译：

The customers are more and more dissatisfied with the way that Internet companies treat their data, which is cause for concern.

改错：我和翻译范文用的同样的句型，但是我的用错了,且例句的increasingly 用的非常好，我觉得对于我来说，问题是我知道要用这个，但是没用对，不妨背下来，比死扣语法好

Internet users grow increasingly discontent with the way their data are treated by Internet companies ,which is cause for concern.

场景：

Many old habits still hold sway in  rural areas, which is definitely cause for concern.