I don't check everything I download from the internet; I don't think anyone does. It depends on what it is, where I'm getting it from, where I'm running it, etc. There are certainly some things I will review carefully, but other things I give just a quick check to see it's not in complete shambles, and others I barely check at all. I typically run the latest Vim from master, do I check every patch to see if after 30 years Bram finally sneaked in a crypto miner or password stealer? Do the people who package Vim for the Linux distros?