Michael, Daniel Defense, founded in 2002, is still going strong. High demand in these unprecedented times have caused all manufacturer's guns, not just Daniel, to be in short supply. They simply cannot make guns fast enough to keep up with the demand.

Michael, Daniel Defense business license is still active, no bankruptcy filings or change of management. In the current sustained high demand, low supply market, smaller manufacturers are simply hardest hit with a higher demand/manufacture ratio. Simply put, they are farther behind the demand curb than larger manufacturers in output volume. Cheers and stay safe!

Another 400 or so here
armslist.com/classifieds/search?location=usa&category=all&page=3&search=Daniel+defense+&posttype=7

armslist.com/posts/13016149/bend-oregon-rifles-for-sale--nib---daniel-defense-dd5v3-dd5-v3----7-62x51--308win-m-lok-adjustable-gas-block

armslist.com/posts/13016149/bend-oregon-rifles-for-sale--nib---daniel-defense-dd5v3-dd5-v3----7-62x51--308win-m-lok-adjustable-gas-block

budsgunshop.com/product_info.php/products_id/110352

gunsamerica.com/981883193/Daniel-Defense-DDM4-V7-5-56-NATO-NIB-FOR-2750-OBO.htm

gunsamerica.com/965554093/Daniel-Defense-DDM4-V7-5-56-NATO-223-Rem-16-Black-02-128-02081-047.htm

DDM4 MK18
https://gunprime.com/products/daniel-defense-ddm4-mk18carbine-pistol-5-56-02-088-01202

50 variants here
armslist.com/classifieds/search?search=Daniel+defense+ddm4&location=usa&category=guns&posttype=7&ships=value

Top link here has a DDM4 V7 in 556 complete rifle in stock
wikiarms.com/guns?q=ddm4+v7

Another 300bo pistol here
sportsmansoutdoorsuperstore.com/products2.cfm/ID/246552/0208822070047/daniel-defense-ddm4-pdw-300-blackout-ar-15-pistol

DDM4 pistol in 300BO here
eurooptic.com/Daniel-Defense-DDM4-PDW-300-Blk-7-1-7-Black-Pistol-02-088-22070-047.aspx

DD is still alive and kicking but even before the craziness they usaully struggled to make them faster then they could sell them
I found one of their complete uppers in stock
DD5 V5 Upper Receiver Group (for 6.5CM or .260 Rem)
https://danieldefense.com/dd5-v5-upper-receiver-group-260.html