From the horse’s mouth
From the late 1980s to the mid 1990s, regular computers and their desktop operating systems introduced various multimedia abilities including file-based audio recording and playback. This came along with various user-experience customisation options like background wallpapers and interface elements that can be set to a user’s preferred colours.
These functions came together in the form of the ability for users to determine what kind of sound the computer makes for particular events like the startup sound, error sound or new message notification.
This kind of customisability was extended in the 2000s with mobile phones supporting ringtone customisation including downloadable ringtones. This feature was seen as important as a way for people to know if it is their phone that is ringing when it rings.
But Google has added this kind of customisability to their Nest Doorbell which is a video doorbell that works via your home network and Internet. Here, they have started offering special ringtones for this product that people can use for particular occasions like Halloween, Thanksgiving or Diwali. This goes hand-in-glove with you decorating your house in particular ways for particular seasons.
These devices would support the seasonality of particular occasion thus allowing the customised sound to play for the duration of that occasion. This avoids the audible equivalent of leaving decorations up beyond the applicable season which can look tacky.
I most likely would see a lot of companies who sell network-connected doorbell / intercom systems start investing in ringtone customisations for these devices. This could include user-supplied ringtones usually in common audio file formats, enabling ringtones to be applicable for particular seasons or user-defined periods, or bringing in brands and talent to create custom ringtones.
You just never know what other “Internet-of-Things” devices and platforms will end up with user experiences that are customisable by the end-user in the same way that computers and smartphones have been customised by their users.