Want to share a strange experience I had: in the year 2014, I was looking for buy a .io domain and was surprised to find that citi.io was available, so I bought it in domains.google.com with an expiration date in 5 years and I also noticed that there was a website called citi.io that I could still visit. I didn't change the DNS settings of the new domain I bought and didn't use the domain.
Then sometime in 2016, I noticed that the domain didn't belong to me. I tried to look up my history of purchase, there was no such purchase record in my account.
Unless my memory fooled me (which I just can't believe), the whole experience made me really confused.