There are a couple of things DPR has going for it is a large historical database of reviews and a large data base of "calibrated" to back up the reviews. While maybe not perfect, the data base of the lab shots from their studio scene provide samples of targets both jpeg and raw (processed in a consistent manner) to support their analysis. I see DPR as a good starting point for determining the performance of a given camera which can be augmented by other in-depth reviews. The trouble with the blog-a-sphere is there is not consistency nor long historical databased to support conclusions. While DPR would be my first stop if I were seeking information about a camera, PetaPixel would be my second. They are different but both tend to be unbiased in their analysis.
Is that worth a subscription? One cannot read the NYTimes, Washington Post, Wall Street Journal or many local news outlets online now for free. Advertising has always been the bread and butter of financing media. Without ads - we would have not had newspapers and other media outlets. Even the worst of the US "yellow journalism rags," the National Enquirer are pushing subscriptions.
It cost money to operate PetaPixel or DPR or DPRevived. DPR and PetaPixel have to raise money to operate. They are not a charity. If one listens to public radio in the US, it is funded at least partially by corporate and individual donations. I get that people don't want to see ads, and ad blockers are getting better. On the other hand - ad blockers cost websites money because it reducing the eyeballs on their ads. Some are going to simply having three levels. One is a minimal access if you insists on using an ad blocker, more access if you turn it off and even more access if you are a subscriber. The Washington Post allows one to look at the front page free and read up to fixe articles a month without a subscription. But to sit down with your iPad at breakfast and read the Post or Times you need a subscription.
Now to DPR, I am not opposed to DPR subscription or membership or whatever you call it. After all it required a lot of money to develop their data based of reviews and studio test. It cost money to maintain and expand those databases. However, how it is done will be important. I'm also not opposed to tastefully done ads. However, the "in your face," pop ups and pop up videos are not only distasteful but also distracting. There is a cat and mouse fight on going between the ad blockers and web designers. Ad blockers are almost hacking S/W, in that they intercept the data coming into the site from advertising servers and block that from appearing. The we web designer put is block for those hacks, then Adguard (or others) will find a work around, then the web designer will find a way to defeat that work around. That also gets a bit disconcerting to have to do weekly updates of Adguard because some of my websites no longer work and will freeze. Having something like Adguard or any other ad blocker can add aggravation just as a VPN can add aggravations as with my VPR, every time I look for something at Home Despot or Lowes, I have to change my location as it uses the location of my VPN server to set the default location.
I expect DPR will go in a similar direction as PetaPixel and most other media outlets that are highly dependent on advertising. It is not a matter in my mind of if but when and how.