I've used Dropbox for 13 years and I have never noticed that they have a cloud search feature, nor have I ever needed that. It syncs to my machines where I have

I've used Dropbox for 13 years and I have never noticed that they have a cloud search feature, nor have I ever needed that. It syncs to my machines where I have my local search working in the exact same manner as for non-Dropbox data - why does Dropbox need a special search, one where they would search my unencrypted data?