Author says it's a 2 person startup. We use communication and collaboration tools such as Skype, Google docs, Dropbox, WhatsApp, etc for personal communication

Author says it's a 2 person startup. We use communication and collaboration tools such as Skype, Google docs, Dropbox, WhatsApp, etc for personal communication which costs €0. Some of the expenses mentioned in the article can be easily taken off with those free tools which are just as good, if not better. If you develop an in-house tool for comms and collaboration, it will be an overkill for even a big startup.