That's true. I've been considering the idea of building my own personal replacement for several Google services - Keep, Drive, and Photos mainly. Haven't decided it's worth the effort yet.
I've been tempted to look into things like ownCloud (https://owncloud.org/features/), but I just haven't been excited by what I've seen so far. What I'm thinking of is more of a single user web app that I build myself so that a) it does exactly what I want and nothing more, b) I know exactly how it works and what it does with my data, and c) there are no other users to support.