Plaid is used a lot of places, including services mostly for the wealthy. For example, a previous startup I worked at used Carta to manage employee stock option

Plaid is used a lot of places, including services mostly for the wealthy. For example, a previous startup I worked at used Carta to manage employee stock options. The default mechanism to transfer cash into Carta to exercise your options was with Plaid. Now to be fair, you also had the option to use check routing numbers to perform the transfer. But I have to imagine that most people use plaid without a second thought.