PC Gamer just posted that they received a statement from Rockstar.
http://www.pcgamer.com/heres-rockstars-statement-about-take-two-shutting-down-gtas-openiv-modding-tool/
The statement is in quotes below, supposedly from Rockstar.
"Take-Two's actions were not specifically targeting single player mods. Unfortunately OpenIV enables recent malicious mods that allow harassment of players and interfere with the GTA Online experience for everybody. We are working to figure out how we can continue to support the creative community without negatively impacting our players."