It seems strange that brands seem to be going backwards in terms of logo design. However, the answer to why they are doing so is quite simple and straightforward.
Where are logos most frequently seen in 2020? On Mobile devices and desktop. For this reason brands are designing their logos to be mobile optimized.
Minimal detail in logo design works better when being used for social media profile pictures or mobile app images.
Warner Bros have ditched their iconic wide gold / blue logo for one that is blue / white and more narrow. This is with the sole purpose of fitting petter on profile pictures and their new app.
In the Case of BT Media you can see how they have made their logo in the same shape as a Facebook, Instagram and Twitter profile picture.