Gmail Bulk Unsubscribe & Cleanup Tool
8.0#2 in email cleanup software$8 one-timeFree planWebLinuxmacOSSelf-hosted
VisitIt suits Gmail users who want to clean up messages in batches and are comfortable supplying Google credentials and setting up Docker or Python. People who need installation help can consider the listed one-on-one service.
You want what its maker publishes above — check its page for the details.