To avoid cheaters come and steal their XLMs.
But, it's always too bad to disclose IDs for such only $25 rewards.
Am yet to understand why blockchain is interested in our identity.
Newbies or seniors, who can well survive through it, will have other great opportunities, so there is no reason to lose IDs and get $25.
I get it that the bear market has affected numerous newbie that came into the market in 2017 but I ask again is just $25 worth your privacy?