@jg10 I haven't tested with a lot of data, but with a couple of free Nextcloud providers I saw a noticeable difference :/. One of them was fine, I wouldn't be able to tell that it wasn't a "real POD". But another one was painfully slow, so I guess it depends on the Nextcloud server.
@jg10 The good thing though, is that since my apps are local-first that shouldn't be too much of a problem. But I'm aware it could be an issue as a general-purpose POD replacement.
However, I think it's a worthy trade off for people who are getting started with Solid. If they know nothing about Solid but have a Nextcloud/Dropbox/Google Drive/etc account they can get started with something like this and eventually migrate to a "real POD" when they need it.