Just my own views on this and don't expect any agreement of it...
To be honest if you don't have permission from the car manufacturers and track owners to use their stuff then all modding is illegal - even if its classic cars distributed for free here on RD, surely. Try and ring any car manufacturer or track owner asking for permission, and no doubt you will be told no or directed to a licensing department where you would have to pay a licence fee and with that would come conditions. It's all well and good trying to get the likes of Jimmy B to highlight it to the smaller sport teams of the various car manufacturers, but if the main guys further up the hierarchy of said car manfacturers realised there their stuff was being exposed and represented to hundreds of thousands of people worldwide without any restraints modding will come to an end.
Don't get me wrong I download the mods here on RD by the truckload and love doing so, but free modding here on RD is on borrowed time as are paid versions everywhere else. Once AC has aged to point of being ancient, and now with rfactor2 being taken over by a business who may look to montize everything like any business would - then bye bye modding.
IMO: Maybe just enjoy it all while you can, and don't indirectly bring the end of it nearer by making too much noise over the likes of simdream to the car industry - don't give them the infamy and historical credit for bringing the whole modding community down with them - they would wear it like a badge of honour.
In the meantime jJust distribute their stuff everywhere for free in non RD forums like reddit, direct peeps there and delete the evidence as soon as said deed is done. No matter how rich people are humans are cheap skates by nature and most will always try to get it for free.
And yes it sucks if you poured your life into making a car mod representing a real brand and distribute it for free only to find out on someone is monetizing it but tbh, aside from a moral claim, you have no legal claim as no license fee to the car manucfacturer was paid in the first place.
Squeeze the likes of simdream out of the market and distribute their robbed stuff for free.