It depends on the game, some are cross platform buy but many you need to buy again.
Some are a hybrid of the 2.. ie i believe beat sabre you have to buy the game for each platform but i think you share the DLC across store (do double check).
if you google there is a list of all the games which are cross buy.
Fiat Coupe, gone. 350Z gone. Dirty nappies, no sleep & practical transport incoming. Thank goodness for VR 🙂
Someone posted this link https://www.oculus.com/experiences/quest/section/2335732183153590/ on the Quest subreddit. Most cross-buy titles are listed there, but some do not appear like Acron.
@VR-OCALA When you check a game like Acron in the Store, you can see it's cross-buy if Rift/Rift S and Quest are both listed in the supported platforms.
@bigmike20vt You're correct for Beat Saber and its DLCs, DLCs were cross-buy for me but not the game itself 🙂