Why was Dominion software specialist Tomas Bellinghausen donating to Act Blue in $2.70 increments?

Why was Dominion software specialist Tomas Bellinghausen donating to Act Blue in $2.70 increments? Like an artist signing his work? Or like a serial killer leaving a memento at the scene of the crime? Asking for a friend…

https://twitter.com/GavinWax/status/1327681457725255681?s=20

Criminals love bragging about their cleverness. A helpful impulse for detectives.