You just defined EVERY DLC IN EXISTENCE.
Er ... no... I didn't.
DLC is an addon to the base game. Sometimes it's based on existing cut content. Other times it's done from scratch post-release.
So in other words, you're creating a massive double standard here. They released 16 pieces of DLC. But the DIFFERENCE between CDPR and other greedy companies is they they made it FREE. F-R-E to the E! It literally does not matter if it was held back or not.
lol how doesn't it matter?
First of all look at the quality of the DLC released. Did you even look a them? One of them was an alternative costume for Ciri. The rest are similar in scope.
These are comparable to the DA2 free weapon and armor DLCs.
So what if they're free? If you're going by relative importance, DAI already has that **** in its base game by allowing you to craft alternative outfits for your companions to begin with.
I don't get this. This is exactly what you call a double standard.
It's free but it's essentially worthless in the grand scheme of things.
Compare this to Jaws of Hakkon. That's an entire new zone, story, etc... This DLC alone has more content than the entire 16 free DLC released by CPDR. Furthermore, production only began in earnest post-release. CPDR has yet to release a DLC of this scope, and when they do you bet your ass they'll charge you for it.
Then you have Spoils of the Qunari, an admittedly small DLC, that was also worked on POST-release. They're going to charge you for it.
And Bioware hasn't done a damn thing with their patches. Really? What content have they released in their patches that is so amazing? Apart from NOT fixing any of the bugs in single player?
Really? Not fixing any of the bugs? The penchant for exaggeration is real. Did you not see that Varric has stopped doing squats? 
Here's a few of the features released in patches, which are often more significant than anything CPDR released as free DLC.
1) Party Storage
2) Item tinting
3) Weapon sheathing!
4) More customization options for thrones!
5) More customization options for trophies!
6) More customization options everywhere!!!!
7) Save import feature for old-gen to new-gen 
What about the Black Emporium and all its features. Again, it has more **** than a few of the TW3 DLC combined.
Let's not forget all the free DLC that was released for MULTIPLAYER.
I mean I know you like to ignore that when doing your comparisons, but MP is still part of DAI.
Between all the added bonus content in the patches, free DLC, and weekly events, BioWare has released more free DLC than CPDR has for TW3 for MP ALONE
and then some.
All of this is coupled with the fact that CPDR is subsidized by the government and has cheaper producing costs being based in Poland.
Hey... packaging what BioWare already releases in patches as a "free DLC" is a brilliant strategy. It's miles ahead of the non-strategy BioWare is employing for its own DLC releases.
Patrick Weekes could barge through the front door of his house, steal every thing in sight, then leave some graffiti on the wall that says Bioware hates you and SofaJockey would probably STILL just shrug it off and say "It's okay, they needed the money anyway." ...Not saying that Patrick Weekes would do that but you get my point.
Judging by your post, CPDR could release a DLC that would make Geralt make fart noises every time he moved and you'd still think it's an amazing DLC because it's free. F R E E.
