I just want to point out that if there was an outcry it wasn't by the actual (recently deceased) artist, who, according to Wikipedia, was happy to see his creation get this kind of visibility.

https://en.wikipedia.org/wiki/Simon_Oxley#Twitter_Bird_Logo_...

Personally, when companies (or movies, or albums, or books, or games, etc.) become worth enormous amounts of money I think there should be bonus royalties for everyone involved even if they sold their labor for a flat rate.

No, I don't have a good plan for how you'd calculate the distribution. But it would make windfalls more fair to the people that made them happen. And that kind of mechanism could also help fund many open source projects.

A lot of the royalty free images I have bought prohibit using the imagery as part of the logo for a company.

But maybe the platform where the bird graphic was sold did not say any such thing in the licensing terms. In which case, tough luck to the artist.

And on the other hand, if there were such terms agains using the graphic as your logo then the artist should have sued and gotten a sizeable payment.

Not all outcries have to be entertained.