PS3 - Why are PS3 games listed on the XMB?

If you saw my other post, I managed to get Irisman to stand alone on the XMB without being in the PS3 folder. So I plugged in my external hdd and

PlayStation 3 - Wikipedia

PlayStation 4 User Interface - PlayStation 4 Guide - IGN

CES: In-game XMB coming to PS3 in 2008

PS3 - CFW Extras XMB Category (v1.00) - See Video & Download of this new impressive mod by DeViL303, Page 3

PS3 Ultimate Toolbox 2022 - Customize your XMB and Much More!

Why are these games appearing on the Xmb? I didn't buy them, nor did the previous owner. : r/PS3

PS3 XMB via Rainmeter 2.0 by 2bndy5 on DeviantArt

Tech ARP - My Thoughts On The Sony PlayStation 3

Confirmed: Trophies, in-game XMB in PS3 v2.40 update - GameSpot

Wicked New PS3 XMB Concepts