MOO is that he is (or was) totally tech savvy. IIRC GGB reported him receiving phone calls from a woman while she was driving, which led her (GGB) to believe that AKA was married. This was in 1998, so still relatively early for a mobile phone in Australia. And I am pretty sure that ER talked about AKA having a mobile phone number, but I can't remember where I read that information.
The few people I knew who had mobiles in the 1990s tended to be tech savvy & early adopters. Unlike AKA they were also juggling busy professional lives. So, if AKA could see the value in having a mobile phone back then, I am sure he would have been open to other new technology developments including the internet - he certainly had plenty of time on his hands to explore options and the motivation to find new ways to identify targets. Of course, his signature MO is to avoid leaving any trail so I am sure he would have been as equally dodgy with his on-line identity as he was with his real life name & address changes.
Basic internet skills would be very useful in allowing him to monitor his targets from a distance. It is not lost on me that AKA targeted AF after the death of her husband. How did he find out about this? How many other victims are there?