It looks like the trophies on the PS5 reward you with digital elements for your profile.
Last week we took a great tour of the PS5 's UI , courtesy of Sony's Sid Shuman. Among all the details, two Trophies for Destruction All-Stars may have revealed that you can be rewarded with items to go along with your PSN profile, depending on the trophies unlocked.
For example, you can see a screenshot of the PS5 UI tour video just below. In the Gold Wreckognised for Destruction All-Stars trophy deion, you can see that there is a line on a "Profile Avatar. "
(Image credit: Sony)
This could mean that some trophies on PS5 games you lock in customizable games for your PSN profile, and this is certainly a plausible theory based on capturing 'screen above.