I do sometimes, but I'm rather sensitive for the ẞ issue: My last name contains an ß and uppercasing would either mean keeping the ß lowercase – the Personalausweis does that (†) and it looks ugly — or doing the ß → SS transformation which is somewhat forbidden in identity documents; a name must be exact. Hence, someday in the future, hopefully, the ẞ. While personal names were a major motivation for the inclusion of the ẞ into Unicode, I’m always happy to see it in the wild in press or book titles or such.

† Although it’s Germany and of course there exists an obscure Verwaltungsvorschrift according to which you can write the non-machine readable field of the Personalausweis/Pass in lowercase, exactly for this use case. I didn’t know that last time but I fully intend to make some poor civil servants life a slight hell the next time I have to renew.