I guess if they're some sort of employee and Uber is paying their tax, their earnings are probably bound to go down

Be careful what you wish for! Same with restaurant workers in this country. For years, they got tips and 'voluntarily' declared it for tax. Some got ripped off by their bosses so the law was changed. Now the company has to record all the tips and tell Revenue before handing it over to staff. So no 'voluntary' telling Revenue what tips you got
