DMX was a pay-provider of what is generically known as ADR (Astra Digital Radio). And although DMX may have ceased, ADR continues as a format. It is very popular in Germany for example. Check out up-to-date transponder listings and you will find a number transmitting.
this last one gives a fairly up to date list of ADR programs.
I would have thought that you could use your DMX receiver to receive any free-to-air ADR broadcasts.