I'm the anonymous editor. I'm responsible for ~95% of anonymous edits in the past year here on MSE. The proof: https://meta.stackexchange.com/review/suggested-edits/55306
First, a little about myself. Back in 2013, I created an account on Stack Overflow, so I could get help for computer programming assignments, as many of my Google searches were directing me there. After signing up, I got interested in the rest of the Stack Exchange network and got fairly active here on MSE (then MSO). I have a mental condition that causes me to want to study and know all about certain interests, and I developed such an interest in how SE works. That interest still persists with me today.
Now, I was in high school at the time, and I ran into some family issues regarding my use of SE. Basically, due to some issues, they forced me to delete my account here on MSE, which is where I was active for most of the time. After I initially refused, they stepped in and deleted it. I kept participating on other sites for another year, but due to further family issues I was forced to quit SE altogether, or face my entire network profile being deleted. As I didn't want my post ownership and reputation to be erased, I chose to quit.
But my interest in SE persisted. As such, I made my first anonymous edit to MSE in January 2014. This was my first approved anonymous edit. I didn't make any more anonymous edits to MSE until late 2014, just as I was made to quit. I then got interested further, but because I was busy at the time, I wasn't able to really start editing until late last year.
Why did I edit anonymously?
As of last year, I'm an adult, so I gained more time to keep this up. But I chose to keep editing anonymously for many reasons. One is mentioned in rene's answer: the majority of edits I made were to FAQ posts, which were marked community wiki, and I wasn't always sure of my edits, and preferred they be reviewed. Even if I started off with a totally new account, I would eventually gain enough rep to edit them directly. Also, I thought recreating my account wasn't worth it since I couldn't gain ownership of my past posts, and as an aside, I wanted to see how the community would react to seeing very knowledgeable anonymous edits.
How do I know so much about SE?
I have a great memory, and could recall experiences from the past easily. Also, I would read over recent posts and chats quite frequently. Based on these, I could quickly form conclusions as to how the system operates. It's really simple logic to me. It's not infallible, though, and is why I preferred my edits be reviewed.
Why did I choose to come out?
There are many reasons why I chose to come out, rather than keep at it editing anonymously.
- My edits were taking much longer to be reviewed. It turns out this is due to the new top bar design, and it was beginning to turn me away from editing.
- I ran into problems with the insta-ban filter, which filters anonymous edits and levies instant bans against IP addresses if they trip a filter. Many times I would false-positively trigger it when making large improvements to answers, forcing me to use a VPN to change my IP. It became too much of a hassle.
- The HTTPS changeover happened, which cluttered the Community user's activity list with thousands of pages full of changes from HTTP to HTTPS, making it harder to keep track of my edits.
- Most of my work as the anonymous editor was editing FAQs. As I've already edited most of them, there wasn't much for me to do.
Will I keep editing anonymously in the future?
I don't know. Seeing as I've recreated my MSE account, I'll likely suggest edits to non-CW posts under this account. But since most of my anonymous edits were to FAQs, I may edit anonymously if I'm not sure of myself (i.e. my edit isn't just grammar corrections, etc.).
Am I open to chat?
Unfortunately, not at this time. Due to this bug, I cannot post on Meta Stack Exchange chat at this time. Until then, I'm chatting on The Assembly.
That bug has been fixed, and I can now chat in the Tavern. (I can't go into further detail on the family issues though; those are strictly personal.)