Why does Fundraise Up Virtuous integration always opt-out contacts from email?
If you do not ask donors to subscribe to your mailing list in Fundraise Up checkout, then it will default to opt-out in Virtuous.
Essentially there are two ways to think of the lack of provision of clear mailing list consent. For the Virtuous integration, the lack of an answer because the Mailing List question was not asked (which would be recorded on the donation as Not Submitted) syncs as an opt-out (if they had no previous value), because that field is just a check box.
Please make sure to configure your Fundraise Up Campaign Mailing list option to Ask donors to subscribe to your mailing list. Once donors subscribe to the mailing list, then then your contacts in Virtuous will also be opted-in to receive email.