First time I heard about Costco was in 2014. I just landed in Los Angeles and settled on Venice Blvd and Walgrove Ave. A few blocks away on Washington Ave is Costco - I also discovered and became a regular at the In-N-Out on that block. I didn't fully grasp the power of Costco at first. As a european, it reminded me Metro. Metro is a food wholesaler. We go there to buy high quantity of things we know, at the best price. We needed a 'professional' card to enter the store though. We had one thanks to our society activity [organizing events and weekends]. I remember at school, it was well perceived to hold a Metro card. You could definitely leverage this.
I've been on Airbnb for more than a decade now. I just checked out, my profile is 11 years old, and I received my first review from a host in June 2013. I remember that stay vividly. Back then I was living in Singapore, and this was my first trip to Jakarta, Indonesia. As far as I remember, I've always been a fan of Airbnb. As a guest obviously; but later on as a host as well; and in between as a fellow entrepreneur.
I randomly listened to 2 different podcasts this week that actually ended up talking about the same thing: consumer apps and subscription businesses.