I was in a broker trader in 2016 where this was still the case. I was brought in when an old sheet cost them $10m on a bad trade because the yahoo finance end

I was in a broker trader in 2016 where this was still the case. I was brought in when an old sheet cost them $10m on a bad trade because the yahoo finance end point it was hitting stopped responding and it just used the last value it had gotten - three months before.