New groups can't demand as much as the next. Also most of the big groups are RaaS (Ransomware as a Service), meaning their affiliates get approval to operate using LockBit's name, infrastructure, and software.
If LockBit does something to taint their image in the media and among security organizations, then rebrands to avoid their negative history, forensics will still eventually tie their new name back to their old org, and victim's will have to decide whether they should trust that their data will be handled correctly after payment.
As for re-victimizing old organizations, there's almost zero chance of that working. Most data is only sensitive for a certain time frame, long enough that they can make the proper notifications, change credentials, etc.
Lastly, there still needs to be someone to download and abuse the data they leak. I've monitored ransomware torrents a few times and not observed any downloads completed over the course of a couple weeks following a data leak.