Why not delete the original file /home/tully/.bio/biodata.tar.gz after the extraction?

[TullyMonster]

$ bio --download
# /home/tully/.bio/biodata.tar.gz: 100%|█████████████████████████████████████████████████████████████████████████████████| 228M/228M [01:33<00:00, 2.56MB/s]# extracting files
# download completed.

Why not delete the original file /home/tully/.bio/biodata.tar.gz after the extraction?