Batman and Dracula are characters that share a nocturnal bat related identity and are also wealthy recluses with mansions. So yeah, that’s pretty much the joke. Whoops Harley and the Joker got them confused.
Bootleg social media feeds and gangsters fighting over social media territory?
Destroy a source of historical documents so that the past can be contested. Sew doubt, confusion, deniability. Hide evidence of past crimes, or inconvenient documents. Plant documents, etc.