This is probably the biggest threat to the incredibly high levels of safety achieved in the Air Transport Industry over the last 80 odd years, this method of maintenance effectively removes a major part of the prevention of errors by removing the requirement of Licensed Engineers to inspect and oversee the unlicensed mechanics work. These mechanics are permitted to work completely unsupervised on the vast majority of tasks called up on Base Maintenance inputs, they are even given Duplicate Inspection rights, and of course the B1 B2 support staff remain 100% legally responsible for any errors these mechanics might make as the CRS paperwork is issued by these Licensed Engineers.
These German maintenance providers operate in many different countries, including the UK and bring with them this method of so called certification, you may be flying next on a 'G' reg aircraft that has been maintained in this way, it is utter madness, EASA is effectively powerless and now the AEI have had to resort to asking the EU to get this sorted, I am a B1 Engineer with 40 years in the Industry, old school British I admit, but have never ever seen such a flagrant misuse and deliberate 'bending of the rules'