At a previous job we used to rent a fair number of servers from companies we couldn't trust (and even if we did, some had security practices so bad that we couldn't be sure they didn't, for example, leave easily exploited backdoors on our boxes. We sunk a fair bit of thought into how we could get some use out of that spare compute we were paying for. Some day, maybe that problem could be solved with FHE, if an efficient scheme could be achieved. Though I'd prefer, in the future, to never be renting shady or insecure servers I suppose.