No, it has nothing to do with first aid training or security, that is simply a misrepresentation of the situation. In London, Uber operates under a regulatory framework that requires these things, and it works very well and has for years. In Denmark, while they did abolish the medallion system (specifically, polical control over the supply of permits), politicians refused to create a similar framework, so the system remains one heavily favouring incumbent taxis.

Crucially, exactly none of requirements in the delta between the new Danish rules and eg. the London minicab rules has anything to do with protecting customers.