its called AB testing / cohort study -- you both are in different group for extracting analytics.
This is common in almost all web-based apps.
In brave built in reader-mode is available to one group while unavailable for other.
you seeing ads in yt because of the adblock you using - which pass "acceptable ads" after taking money from google.
Your this ad-blocking setup is doing more harm than benefit and stressing the system.
just install
https://ublockorigin.com/ keep the default filters and add
https://github.com/StevenBlack/hosts
get the - Unified hosts + fakenews + gambling, flavour if you use any social media including linkedIn, and *ahem* sites.
if you feel uBO little overwhelming to begin with - start with
easy mode, see this
https://github.com/gorhill/uBlock/wiki/Blocking-mode
if you are technically sound, use medium mode - but you have to train the dynamic filter for some time ( manually).
-----------------
back to the topic,
@becool773 try Brave or Opera GX if you haven't already.
If on windows 10/11 .. Edge is pretty much one need, with few addons to stop MS's call home.