REACH covers particular chemicals (Nonylphenols) that are found in a lot of products that are carcinogenic. One of the most widely used by individuals are in nail polish/varnish but they are used widely in manufacturing of rubber tyres, detergents, lubricants etc
This is another case of firearms holders getting all defensive over powders and the interfering government/EU picking on hunters/shooters. The chemicals are deemed hazardous to health so have been banned in everything they are found in, the fact they are found in modern ammunition powders is a tiny insignificant proportion of where they are found and are simply collateral damage so to speak.
Mercury is one of the things banned by REACH so there are probably a few people kicking up a right fuss about not being able to buy thermometers with mercury in any more and how they'll have to make do with the red chemical variants which "aren't as good" etc but failing to see that the tons of mercury previously used in batteries, pesticides, fluorescent lights and wide scale preservatives which all ended up in the environment somewhere are now being stopped.
Its the wider scale use that is of concern, the tons of powder used by reloaders in the EU is insignificant compared to the amounts used in other industries.