On Playstation's game page for GTA Online it says that the free standalone version can be claimed only on PS5 console store. So its not free to claim for everyone from the
Grand Theft Auto V
Grand Theft Auto V : Édition Premium
Grand Theft Auto: The Trilogy — The Definitive Edition (PS5 & PS4)
Grand Theft Auto V (US)
Grand Theft Auto V coming to PlayStation 5 in 2021 – PlayStation.Blog
PS4 users be warned: Sony temporarily scrapping major feature ahead of PS5 release | Gaming | Entertainment | Express.co.uk
Grand Theft Auto V (PS4™ & PS5™)
Grand Theft Auto V (PS4™ & PS5™)
Sony $20 PlayStation Network Card GTA V SONY PLAYSTATION PS4 GTA V $20 - Best Buy
Buy PlayStation gift card & PS Plus membership cheap! | ENEBA