I've been seeing some of that, but there are apparently also a ton of bots being created for who knows what reason and that's spooky. (it made the user count jump up in hundreds of thousands) Can't say I know much about that, but I'd imagine it'll cause some issues sooner than later...
I had to manage some auto registered bot accounts on my test instance. They didn't do anything yet but it was pretty obvious they weren't real. Randomly generated usernames and all created within a minute.
Reddit accounts are being sold online all the time.
Creating bots is easier early on, when the securities don't exist yet. Creating an army of account is currently cheap, but may be less so in the future.
They are just betting that their army of accounts are going to be valuable in the future.
Selling Reddit accounts relies heavily on karma though, which Lemmy doesn't publicly keep track of. It's more likely they'll be used to push spam or disinformation.