You don't know when they will simply decide not to give you access to certain data. Look at email providers who suddenly decided "If you don't use it for X mon

You don't know when they will simply decide not to give you access to certain data. Look at email providers who suddenly decided "If you don't use it for X months, you're inactive and I'm deleting everything". It's not about the service existing but people being able to extract and use what they've put in, in 10/20 years.