RapidSpace doesn't erase your data after you leave us. You need to do it yourself. We just erase a little bit of data so that the disk is not bootable : https://lab.nexedi.com/nexedi/slapos/blob/965658082bc2c9b1b63ea15715082167e6c260af/software/kvm/instance-kvm.cfg.jinja2#L832)
If you have some private data, you should ensure to remove it properly from the disk before ending your VM: