It can inspire you to copy others' work. But there are some great photos posted, if you know who or what to follow, that can serve as inspiration. On the other hand, a lot of what is posted is the usual selfies and food.
Welcome to 21st century photography!! It's the way things are.
In many ways, nothing much is new or has changed here. In the '60s and '70s the Instamatic photography was the rage with the mon/dad shooters; in the '80s and '90s we had Happy Snaps (known in the prolab trade as Crappy Snaps), then in the '00s digisnaps (= digicrap). Instagram is just the latest progression in the meaningless photography syndrome, the endless bad landscapes, babies, cats, dogs, cute baby doll pouts and other people's food. The low cost and the ease of digital photography has just meant an ongoing proliferation of mostly meaningless images - I originally wrote "junk images" but I've now decided that's a bit too harsh. And Instagram is the latest platform for all this visual flotsam, as Flickr was 15 years ago and other web sites since, many of which have come and are now gone.
As for the sad proliferation of "disposable" negatives, I no longer do color processing at home - I rarely shoot color neg and never color slides due to problems with chemistry supply and cost, and I shoot almost all my color with my digital Nikons (I still do all my B&W in my home dakroom, so that at least endures). The prolab in Melbourne where I occasionally get my C41 processed, routinely makes (low-res) scans of everyone's images and sends them online. Unless you specify you want your original negs returned, off they go to the shredder - and if you want them posted, you pay extra. Which makes me feel a little sick, but it's how things are.
Change in constant. As the Buddhists say, "faeces happens".