Most of Google's competitors would do well to focus on privacy, because that is one area in which Google will most likely not be able to outdo them. Google is likely to be better at machine learning or most other technical qualities of whatever products you're competing in. It still is, however, a data analytics company - that's where its main strength is, and that's what pays the bills. It will therefore be almost a guarantee that it will be worse in the privacy department than a competitor for whom that is not the case, so that's what they should capitalise on.