Most designs you see in the digital space branded as ‘Brutalist’ are very far from Brutalist.
Brutalism is raw, minimal and void of decoration. It’s the raw material on show, without veneer.
It might have started in Architecture but its principles and ideology is transferable. There are plenty of brutalist websites; Craigslist and Wikipedia. Half of punk music is brutalist, to the extent they play 3 chords to keep things as raw as possible.
But, blinking text and wildly bright blue isn’t brutalism per se.