Hi, Spaghetti Monster! 
My name is Yuliya, and I am the Quality Control Lead on the OSM team at Lyft.
Thank you for your feedback. We implement turn restrictions based on signs or road markings. In this instance, we overlooked the sign "except bicycles": https://drive.google.com/file/d/1LqrJvVb8CLCMDuaUVAN2MId8Ny58Lswq/view?usp=drive_link. We should have applied the turn restriction with an “except=bicycle” tag or added “no_right_turn”  as you did. We greatly appreciate your correction of our oversight and value your contribution to OSM.

Best regards, Yuliya
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            Published using OSMCha: https://osmcha.org/changesets/152293790
            