From own experiments and all the forum posts I can now certainly conclude, that IDrive caps the transfer rates. There are now three options:
1. You uncap the transfer speeds (that's what I and probably everyone else would prefer)
2. You clearly state somewhere, that You cap the speeds at 100 kB/s (at least one would know, what one buys)
3. You refund the money due to obviously giving false promises ("IDrive does not cap the transfer speed")
I demand a statement about this here in the forum so that everyone can read it, because handing people over to the support hasn't brought any light into the darkness.