DonFerrari said:
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You can grind all you want, the plat will be unavailable until challenges are enabled.
Credit where it's due took the longest to get, I unlocked it on oct 19th. It didn't feel like grinding though. I reached level 50 the day before and have over double the amount of fame already (37m)
Challenges must have worked for a bit at the beginning. The trophy to send out a first challenge was at 0.5% when I got lvl 50. It has now dropped to 0.2%. The user base has grown quite a bit.