If you are a Prime Gaming subscriber and haven't yet linked your account with your Rockstar Social Club profile, you're leaving a bunch of freebies on the table. Not only can you get a steady stream of cash in Grand Theft Auto Online, but a bunch of expensive upgrades and vehicles are among the benefits too.
Some of the bonuses you'll get for linking your accounts is GTA$200,000 every week, with extra thrown in when playing for 4 consecutive weeks, access to the exclusive Vespucci Canals Nightclub, the Sonar Station upgrade for the Kosatka submarine — introduced in the Cayo Perico Heist DLC — for free, an 80% discount on the Pegassi Osiris and a 70% discount on the Progen PR4.

The Sonar Station upgrade usually costs GTA$ 1,200,000, and can be used to detect caches and treasure chests which can net you up to GTA$ 7,000 each. Meanwhile, with these discounts the Osiris is down to just GTA$ 380,000 from 1,900,000, and the PR4 is down to "just" GTA$ 1,054,500 from 3,515,000.
So, how can you go about claiming all of these bonuses and rewards? First of all, you need an active Rockstar Social Club account and an active Amazon Prime Gaming subscription — this is what used to be called Twitch Prime before the recent rebranding.