As mentioned in the response to the sibling, I am not just talking about hosting the data, but also running the app. Ofc, with a lot of traffic the running costs would increase.
The reason for the higher price is that both data and running software is redundant and decentralized by design - no need to configure anything.
That phrase does not address where and how to host data and run software, and while I think an e.V. would be a great idea, it also does doesn't address it. So these concerns seem orthogonal to my input.
The IC Protocol is indeed about redundancy and resilience, but also about sovereignty and security, and it does not just host data (like torrents) but also runs software in a verifiable way (in particular, for every message you get from a dapp on the ICP, you get a certificate that proves that the majority of nodes in the subnet agree on the result).
In a nutshell, it's a platform that gives you many guarantees (security, redundancy, sovereignty) out of the box - as opposed to classical solutions which have to be composed of many different building blocks that need to be orchestrated to work together.
The European, GDPR compliant subnet of the Internet Computer could suit your needs. The app would be decentralized out of the box and it can't be shut down by a single entity like a traditional cloud provider or nation state. Hosting 100GB costs about 500$ per year [0]. This is not a traditional hosting provider, it's a decentralized cloud. Reach out on the forum [1] or to me if this sounds like a good fit to you (I think it does, from your list of requirements).
The reason for the higher price is that both data and running software is redundant and decentralized by design - no need to configure anything.