Well I think it's kinda hard to imagine a free service that doesn't do either data collection or advertising (read: you are the product), with advertising it makes sense through being a more openly a field that has a lot of money circulating around it, and while I don't think the average person cares about data collection to the point where they'll ignore products that do it, it at least serves as bad publicity
The only other viable model I can personally think of is subscriptions, I find it hard to imagine that only forcing big corporations to pay to use your service, or that having it be donationbased would work with the amount of manpower and serverspace these products from within Silicon Valley typically host that need a lot of money every month until they stop existing