Some "100MB" rips go a step further by removing textures for menu backgrounds, HUD elements, or even downscaling character models. In extreme cases, they remove non-English language files entirely.
Emulation (if you own the game legally)
Compression tips (for your own legal backup)
To ensure a 100MB-200MB rip runs smoothly on a potato phone:
If you have decent internet (10 Mbps), just keep the 1.1GB ISO on Google Drive and stream your emulator via PPSSPP's "Remote File" feature. No compression needed.
If you want a highly compressed version that actually works, follow this method. You will end up with a CSO file roughly 380MB, which is the smallest stable size.