why can't bots have snipers in a snipers only custom match

So basically why bots don't get snipers in a custom match when all other guns aren't allowed
I linked a video of gameplay i recorded on ps4, look at the times below
1. 0:31-0:35
2.3:35-3:46
https://www.mediafire.com/file/kqbwd09mc...9.mp4/file
copy and paste that into your search bar the video link