Email logo validation and prominent display seems like a perfectly valid use case.
See arguments about red-warning unencrypted HTTP and how that pushed the web to update.
Add in that genAI is going to make plausible-looking phishing emails a lot easier for the world to generate en mass, and giving the everyperson something better than "decide if it looks suspicious" is important.
Logos are bound to trademarks, which are split by country and type of business. Anybody could get a BIMI of a duplicate of your logo if they just register a different trademark in some different business (and/or country). Therefore, BIMI does not guarantee what they say they do – logo trustworthiness – and is therefore a scam. If your trademark is not valid and known globally, BIMI does nothing for you. This explains why only huge entities – i.e. with such trademarks – have ever expressed any interest.
A dead giveaway would otherwise have been that the BIMI issuers are all the now-panicking EV certificate issuers, which nobody will now buy.
See arguments about red-warning unencrypted HTTP and how that pushed the web to update.
Add in that genAI is going to make plausible-looking phishing emails a lot easier for the world to generate en mass, and giving the everyperson something better than "decide if it looks suspicious" is important.