Most likely it depends on the context and the intention for your app/business, as well as the incentives the user has for such actions.
If we're just individuals making an app and growing a personal email list with/for it, our share button will be (subconsciously detected and) ignored. Also, we simply must have an app worth sharing first, otherwise it's all for nothing anyway; that share button could get clicked and still mean nothing.
for example, the social media buttons will certainly be used if our app's demographic is the active Instagrammers crowd, they hit like buttons all the damn time.
Those sharing buttons will also get used more heavily if there is some kind of reward for it (free content?).
Those are 2 specific cases, I expect most other cases therefore lead to the 99% of unused actions statistic above.
Work on the app quality. If we build it they will come.