But did this happen
As I said earlier on this thread, in the old days, if I'd have let lose such a system on my users, I'd have been slaughtered.
I have worked in industry on very large software projects for the last 35+ years. It is not just the old days that you would get slaughtered.
As the years have passed more and more emphasis is placed on testing the system at each stage and getting it right before it's released with all the quality controls in place. So what difference is there between a system designed for a spaceship, a power station, a bank or a military establishment and that produced by FindMyPast. There should be none, but the difference of course is the end user. In FMPs case it is the humble home user in her/his search for information for their pastime. And if it is wrong when released, we'll still have elecricity, we won't be invaded by a foreign power, nobody will be mortally wounded and FMPs profits are unlikely to decrease as the more casual researchers are enticed in. The end user in this case only has the power of not paying their subs. Many more first timers will replace them.
If such a dire product had been released at my place of work, there would already be people on gardening leave awaiting the inevitable.
Simon