I suggest you check this out. Now that Ancestry.com owns FindAGrave.com, I would guess that some agreement between MyHeritage.com and BillionGraves.com was almost inevitable. I might also mention that an updated Index and link to BillionGraves.com is also on FamilySearch.org.
Does this mean that the gravemarker race is now on? I certainly hope so because all of us out here in the genealogy community can certainly benefit from the preservations of all those millions of gravemarkers. Oh, by the way, here is the description of the project from the new landing page:
MyHeritage has teamed up with BillionGraves in the great initiative of documenting every headstone in the world with the free and simple to use BillionGraves app.
BillionGraves is MyHeritage's preferred cemetery headstone crowdsourcing application. With patent-pending technology, translations into 25 major languages, as well as advanced systems for handling Gregorian, Hebrew and Julian dates, BillionGraves is the best international application for documenting and preserving headstone information. It's fun, too! (in a unique way that only genealogists would understand).
Register for free on this page. Then download the free mobile application for any iOS or Android device. All information you contribute will be posted on BillionGraves and MyHeritage SuperSearch where it will be free for all users. MyHeritage Record Matching will match it for free to the 27 million family trees on MyHeritage.Hmm. Interesting that the largest cemetery in Phoenix, Arizona, the Greenwood Memorial Cemetery, with tens of thousands of gravemarkers has only about 40 images on BillionGraves.com and only 11 images on FindAGrave.com. It certainly looks like both of these sites have a ways to go yet. I also note that cremations may pose a challenge.