I know, I've used Brave Browser, and got BAT tokens, but when I wanted to claim that I was required to do KYC using Uphold, if I'm not mistaken, basically in my country it doesn't support this platform, so until now I never used Brave again.
I have been using Brave for many years and have received many benefits, especially in blocking ads very effectively. I save hundreds of hours watching ads, hundreds of GB of data and work more efficiently. I also have some BAT in the rewards section but haven't tried withdrawing it yet. For me, Brave has given me a lot of value, I don't use Brave just to get BAT tokens.
If you don't want to complete KYC, you can temporarily ignore this feature, continue using Brave and get more BAT. Once their value is large enough, perhaps several thousand USD, and the regulations in your country have changed, you will be able to perform KYC and withdraw BAT.
You can also consider those BAT tokens as an asset and a gift for your children 
Unfortunately, until now the Uphold platform still rejects KYC from my country
even though there is a lot of BAT,
Is this a marketing trick?
I think this KYC rejection is so that the BAT coin does not get Dumped because of the sale of Brave's claim. But I also think that the country that is banned for KYC seems to be related to the business of BAT and Brave.
I am willing to have my BAT embedded in Brave, and seeing the current price, BAT is not that good so I think it will be a waste for me to do KYC, it is not comparable to what is produced
Maybe in the past when the price of BAT was high, the price was complicated by KYC not being approved. Now, if KYC is approved but the price of BAT is very low and that's true what you said, it doesn't match our expectations and I see BAT as a coin that is slowly dying.