So you use cash to get a burner phone for any online purchases or sites which need them? You kept your phone turned off and away from you when you bought that burner? You only carry the burner when entering large corporate store chains which are fingerprinting the devices inside? You have gone through all databrokers to see who is aggregating information and device ids on you? You magically know every single big techs obfuscated domains for tracking cookies and block them the moment they are registered?
I think you are extremely naive about how easy it is to tie this information together by a databroker who is not restricted on what information they can aggregate and sell back to companies like meta. Sure meta may be blocked direct access on your network but they are buying that information from another data broker and tieing directly to you based on the contact information thats been gleemed from others who shared contact information with a meta product.
If having shortcut remaps wasnt useful or it was a legal nightmare, all the big ides would not have the ability to change their shortcut mappings to match other ides in order to make transitions easier for developers. Its a huge win for accessibility to ones software and basically just comes down to putting your shortcut definitions into a config file that can be swapped and allowing others to create maps to be added. I cant imagine that being the biggest hurdle, even if all the devs for gimp did was abstract shortcut definitions to a config file they could then allow others to submit PRs to add additional options for users to choose from.