I'm pretty sure, not knowing details that the simple reason is that Amazon was losing money with DPR.
More likely Youtube, Tiktok, Rumor sites affiliated links were driving more sales and with less investment than this site to Amazon, plus Smartphone keeps getting better, although never a replacement for Pro work and folks here were not clicking the ads.
Add the fact that the camera market has matured, slowed down and the economy is in trouble, it all makes for the perfect storm.
Now, I believe there was potential to make this site profitable.
DPR should have tried as last resort, a subscription model with extra perks but still free access with limited features, or some other ways.
Looking at the large outpouring of comments, even emotional ones, gives me the impression that this site has room for profit and management couldn't figure out how to make it viable.
There are other sites like Imaging Resource with less readers that somehow have managed to survive. Go figure...!
Considering all that, I believe it was a bad, rushed decision.
Yes, corporations make mistakes. Otherwise we would still buying Kodak cameras from the Sears online store using IBM computers or a Motorola smartphone.