I think not. I thought about it many times as well. But I rather pay a trusted service as proton or tresorit. You still pay for it, if one does not want them to market your private metadata. But for myself it is defnitly cheaper paying a service then hosting something myself. And most probably it is more secure. Since in a service there is more resources to make sure it is save, where on a selfhosted system it is easy to implement weaknesses.