Users are leaving cause of these things: Loss of inspiration. Loss of motivation. Having to keep up with other users. Real world stuff(family, personal, etc). Some(including myself) are getting bored. The community is getting larger, imagine a small town with a population of 1,000 people, not too much things going on, its easier to interact, now imagine a big city with a population of 5,000,000, its harder to interact cause there are other people that may get in you're way, since simple planes is getting larger, its gonna be harder for users to interact. And finally, simple planes isn't new anymore, users get used to it, and end up getting bored and leaving, and some games are able to maintain users for several years by updating and improving quickley, like for instance minecraft, that game has had around 127 updates(this includes bug fix updates, holiday updates, etc), that game is the most popular sandbox game there is, and its maintaining its users by adding updates, alot.

I'm stealing all the thunder
Jk
I disagree with this statement..
By no means is it decreasing, it's been spiking and continues to spike since the release on steam, then since YTers

@PlanesOf0ld ahhh I'd say I haven't changed y tactics and I build well if I say so myself

They are all lurkers and can't find your planes due to the tsunami of copies jelly planes and terrible planes in the newest and hottest section so only your followers know if u have uploaded a plane...

I think it's just life people can't be n 24/7

@TehDuck also a example I used to post and I'd get like 3-5 up votes right off the bat and now none its like nobody looks at new planes anymore?

@TehDuck idk I just don't see as many people going through the new planes and up voting them! And I've seen bronze who have made great planes and have had like no up votes and 2 downloads!

I don't think so why?