In the UK: https://ico.org.uk/your-data-matters/be-data-aware/political...
"You have an absolute right under the Data Protection Act to object to marketing from any organisation and the processing of your information for direct purposes. However, a candidate, political party or referendum campaigner does have a right to send a Freepost mailing, as mentioned above."
And under GDPR it's all about consent: https://www.superoffice.com/blog/gdpr-marketing/
"Data permission is about how you manage email opt-ins –people who request to receive promotional material from you. You can’t assume that they want to be contacted. In the future, they need to express consent in a ‘freely given, specific, informed, and unambiguous’ way, which is reinforced by a ‘clear affirmative action’."
Specifically, nothing in Expensify's EULA or settings allows me to opt out of the CEO's political views.