

First game I activated was a retail copy of Half-Life Platinum Pack, in August 2004. I had made by account few months earlier just for fun right after Steam originally launched.
The first games I bought from Steam specifically was the Orange Box, and AudioSurf in 2007.
The orange box was $61, which inflation adjusted means it cost $99 :)



It removes them from all the suggestion places like the discovery queue and front page. For search results IIRC you have to ignore individual titles, and set your steam search settings to default to “hide ignored items”.