Lets stop taking crazy pills for a moment. I remember from my time afking on Abathur before inactivity kick was introduced that in a game with 9 AI my team would win at least 8/10 games regardless of bot skill level. I don’t want to say it is literally impossible to lose but that is much more likely to happen late in the match around 20min or so when objective scaling kicks in and you really need play carelessly to let this happen.
Less than couple of percent beeneath 100 could be attributed to a mix of disonnects and you being a leecher in co-op, but it should be very much impossible for five humans to lose unless they’re on their first dozen or so matches and clueless about the game. You may not be able to brute force an entire team of AIs alone but two or three players attacking in sync will much more than suffice.
Long time ago you could see accounts with a higher than 10% loss rate and from their match history it was evident that they are spending an entire day botting. Since then, cheating software has come a long way and can now almost emulate human like input.
Nowadays with everyone doing it, it has become possible to catch someone with 75%.