Getting your website hacked is already super stressful and getting it clean is imperative. What adds to injury is the fact very often the website in question will also be blacklisted.
The reason for the website to be blacklisted is really simple – the website was hacked. Website owners quite often aren’t even aware they have been hacked and the first red flag that something is happening is the website getting blacklisted.
Blacklists are formed and websites are listed there to warn innocent visitors and other participants of the internet that they are in danger if they visit the website in question. They are there for a good reason, but that is why website owners feel additionally violated when their website pops up on such lists.