Look what happens with all exploits are the following.
1. Players find an exploit and no one tells the devs about the exploit. So that is like a bug going unreported. Then players can abuse that exploit. This case has a high chance of being the case for most exploits. Players are not as honest as you think they are these days.
And yet Blizzard still twiddles their thumbs when people have been coming up to them and say "Look, something is wrong. We need you to fix it."
If you get so many people reporting the issue, there's a good chance that there is indeed something wrong. Which means that instead of all this thumb-twiddling, they need to at least look into it. Even if it turns out to be a false report, at least Blizzard shows that they care. It's good PR, even if nothing comes of it.
The fact that people have been reporting the issue, and nothing has been done about it (until now) makes Blizzard look like they just don't care, and any excuses they make (like "we missed the bug reports") look like sorry attempts at damage control (even though this likely isn't the case.) How does a professional company with hundreds of employees miss bug reports? To me, it shows that someone isn't doing their job correctly, and needs to be reprimanded at the very least. (I don't believe in firing people, except in extreme cases, because jobs are VERY hard to come by these days.)
2. Players find an exploit and some use the exploit. The ones that do know about it do not report it. Then the devs work on fixing the exploit. This is not as high as number one or number three.
True, there are dishonest types out there, but the vast majority of players ARE honest, and want a game where everyone can play on equal footing.
3. Players find an exploit and some use the exploit. The ones that do not use it but know about it report it. Some of the exploiters will come on the forums and discredit the ones reporting the exploit. They try to get the devs to think that it does not exist. So if the devs do not believe the reports then nothing will get done. Out of the three this has the highest chance of being the case in around 70% of the cases of exploits.
It is even worse when you have it show up on the PTR. Because there it is not gonna be seen by all players as a rule. Because not everyone goes to the PTR to test the new patch. So the amount of players reporting on the issue would be much smaller than on the live server.
This is where Blizzard should be paying EVEN MORE attention, because every bug report can potentially catch any bugs before release, when they become not only a problem for the players, but for Blizzard as well. My dad ran a computer repair business (which I'm running now) for nearly 23 years before he died, and if we provided that same level of service to our customers, rest assured we wouldn't have been in business as long as we have. Yes, just about every company makes mistakes, but the TRUE test of a business is how they deal with those mistakes. I know the computer repair industry is slightly different from the gaming industry, but the same basic principles apply to nearly every business, no matter what industry they choose to enter.