Escape from Tarkov and Hitman 3 are games I play with online progression.
Unofficial mods allows to run local webserver, re-direct game app traffic to localhost and configurable progression. Naturally it doesn’t carry over to online progression.
Tarkov - Used to use PvE offline to gain access to all weapons, adjust enemy AI reaction, accuracy, get to play with ALL weapons and ALL attachments I want freely, infinite cash, max traders, explore maps freely and add waypoints etc. Perfect way to practice and try new things before going live.
Hitman 3 - Progression/grind no more. Full access to all map starting points, weapons etc.
Means truly own the game if never have to rely game servers in case they shut down in future and everything unlocked.