DHL Express is owned by DHL, DHL is owned by Deutsche Post, together they are part of the
Deutsche Post DHL Group.
20,57% is still owned by the German Government.
Tracking numbers do not always work. I have had enough trouble with DHL showing it is in the US, and USPS tracking still says "shipment announced". The gateways between countries often don't work.
Shipping times vary a lot too. My record holding package so far was six months to New York City.
If the value is below EUR 1000 we didn't have customs checking packages going outside the EU,
but that was before someone started trade wars.