If you like biking when traveling to a new city, this will be convenient.
Bicycle rentals at points of entry (airports, train/bus stations) delivered to your accommodations. You just pick a bike and either have it delivered to your accommodations, or even ride it there. You can also reserve online in advance.
Works of art can cost a lot. Tou still need and want art in your life, how can you get the pleasure without the prohibitive cost?
For artists and galleries, it’s a predictable income source, with the added option of gaining a repeat buyer.
Rent the work of art you like. Directly from the artist, gallery, or even a unique marketplace. If you fall in love with it and want to keep it, just buy it. Many purchasing options could be used, like deducting the money already paid for rent, having a fixed length leasing contract with a buyout option at the end, etc.
You can watch your kids and stay calm without moving a finger.
Have a binocular rental service at the beach. Watch your kids (or anyone else you find interesting), while staying comfortably in your comfortable chair at the beach.
You want to have a publication for you business, a niche you want to enter, a subject that is close to you etc. you don’t have the time, knowledge, writing and design skills to produce constant quality content.
Stock posts. A place that is modeled after the stock photo marketplaces. You can rent a post you find an like for a small fee, buy it out exclusively for a higher fee, or request one be created just for you.