Database leaks are something that concerns more than apps/services using my metadata to target ads at me.
I use some cloud services but not Google photos. However, almost all of us have even more personal information in the cloud than photos and videos. All banking, mortgage, tax etc information are in the cloud in some form now a days, actually have been since before "cloud" was a normal part of our vocabulary.
I wouldn't stop using services like Google Photos because it's important to all of us that we have our photos and videos backed up. The days of your HD dying or losing your phone with the photos and videos on it aren't the end all be all.
I think staying informed about these issues and making sure you have all security and...