@Flazepe, there is no automated system, or plans to delete archived accounts. The only thing that would cause archived accounts to be deleted is if we ran out of storage space. I was curious so I ran the numbers.
The average archived account takes up 29 KB, and we currently have about 3.8 TB of space available for archived accounts. So we have room for about 128.7 million archived accounts. The number of accounts we create each day varies wildly depending on how overloaded the servers are, but let's say we create on average 100 accounts per day. That means we wouldn't need to start deleting archived accounts for 3526 years.
TL;DR: We don't delete archived accounts unless someone requests it.
@Psoltani, I deleted your hosting account. Would you like your forum account deleted as well?