We currently have the tags springer, springernature, sv-classes. The last one is the more widely used tag, with over 130 questions currently. The other two have only around 10 questions each.
Should we synonymize and merge the two smaller tags into sv-classes? I'm not sure that there is a need to disambiguate the questions about the class files of Springer-Verlag and Springer Nature, even if they are technically different publishers...
Related: Tags for Springer-Verlag classes, though that was discussed over 9 years ago.