If its intent is to keep us connected and congratulating each other on work anniversaries, fine.
I do refrain from using it to wish happy birthdays, which IMHO, are Facebook material, not LinkedIn.
But…and a big but…if the work anniversaries are small in number on a given day or there none as was the case today for me, LinkedIn Connected starts offering people for you to connect to, and on and on they spew out. Until you have to shut the app down.
You already know my opinions on connecting to people you have not met or know in business, so you then can surmise my reluctance to connect to people who a mobile app suggests to me.