Fortunately, Plaid doesn’t sell your transaction history, so this isn’t a concern.
> We do not sell or rent personal information that we collect.
What Plaid has said on record they DON'T do is take that data they provided to the broker, bundle it up, and then sell it to marketing firms or hedge funds or other random third parties for which the user didn't explicitly ask their data to be shared.
See: https://www.americanbanker.com/news/lawsuit-against-plaid-he...
“Plaid does not sell and has never sold consumers’ personal information or data. Consumer data is obtained and used with consumer consent. Plaid believes strongly that consumers should have permission-based access to and control over their financial data, and embodies these principles in its practices."
That's pretty strong language.