Just don't host anything. Keep everything in RAM and volatile. That is a big thing I look for in web services. If you can do a thing in the browser and keep it

Just don't host anything. Keep everything in RAM and volatile. That is a big thing I look for in web services. If you can do a thing in the browser and keep it as local as possible to the user and have them or parts close to the edge of the user do the work for them then do that and don't store anything permanently. If you have to do things on your own server side then also don't store things for longer than you have to to complete whatever the operation is for the user. And advertise that and declare that to the user.