The German Turbo offer has been around for a couple of years now and it was was also posted on FT.
The bonus might actually only be valid for the first €40k but after I maxed this out in 3 months I just registered again a month later paid my € 15 fee and the whole bonus started again from scratch and so on and on.
Effectively you are buying 20.000 MR points for € 15 each time.