DCI there may be some apps like that, I haven't used any. Take for example the sheets cloud based excel. It is terrific has lots of features that excel doesn't come with and has no ads.
As for your privacy. To a certain extent, but I know google's security implementation is very good. Can google see your stuff? They shouldn't be able to, but they might be looking at it. I use Huawei too for cloud and I wouldn't trust them as far as I can throw them, same implementation as google, I just wouldn't trust them.
As with all things be cautious and don't stick anything sensitive on there.
I know Infosys will not use public cloud for work based stuff as it is not secure enough, we have our own cloud implementation but it doesn't come with free stuff!