Some individuals simply think of piling up things without specific purpose, no plans as to what to with them and usually accumulate this for a long period. In the meantime, these items can develop things like mold growth, which is a bacteria colony that could be carriers of infectious diseases. Persons who do this kind of collecting are called hoarders.
They hoard simply because they might not know what to do with the things that they take on. And when the accumulated piles need to be removed, there are services like hoarding cleanup Indiana available. Removing hoards is a sometime specialty for a trade which encompasses many concerns for cleaning things up.
Hoarders though often develop a special set of animal and insect species specific to what they collect. There might be unwashed food on these, or digestable stuff which rats could take on, cockroaches want to inspect and bacteria to make their homes on. There will be more powerful industrial grade chemicals in use for this process.
Cleaning up after a hoarder can be risky, or downright dangerous since you might inadvertently step on, say, a nesting snake that is poisonous. The pro personnel who usually do the contracted removal job can have protecting clothing and tools to turn over suspicious items. They know which things are ideal for what species, many of which may be harmful.
The domestic pests are at their happiest with any piled up pieces of disparate items. These might start out with unused furniture, and then magazines and books thrown on their surfaces. Later on, some used kitchen utensils are added into the mix, and still later, all sorts of stuff which folks tend to collect like pack rats do.
This instinct is part of human nature, sort of hedging against the future when some useless items now could be useful. But there is not enough time to address these and people not needing to clean this up simply lump them in one corner and watch the pile grow bigger every day. Some of the things which could be found there might have surprisingly value.
The majority of items though will be cracked, damaged or otherwise degraded from overuse or from work done by household pests. This need to be removed or disposed of properly, the place fumigated to prevent anymore growths from developing. Some growth may be microscopic from the start, and the molds are composed of numberless single cell bacteriophage.
You could easily contract an outfit to do the job for you. When you hoard for a long time, chances are the piles you collect are no longer manageable. You do not have to risk anything, perhaps injury or disease, just to address this.
In any case, the company carts out your stuff, and could find uses for them when they are recycled or upcycled. It all depends on your preferences or hobbies of this kind. These items that you find interesting today though may no longer be this way tomorrow, and the likely thing is that you simply throw these away without too much thought.