I don't think this way because I like to collaborate. If a colleague can benefit from a tool I made I'm proud to save them time. I also think your attitude doesn't pass the golden rule: would you like to work on a team full of people like you?
But when I've been stuck for a while in a dysfunctional team, I've definitely seen the flip side where other people will find ways to take a lot of credit for minor iterations on my work, where management will reward my productivity with high expectations and high pressure to continue the trajectory they perceive in a single idea, and when the tool becomes a support burden because too many people think it should solve all of their other problems too and I'm now perceived as being the owner of this thing they depend on.
If your only goal is to maintain a performance lead on your peers, you either need to gain and keep an advantage or find ways to actively make your coworkers disadvantaged (or both). And if you're already doing 1) then 2) isn't a far stretch.
> would you like to work on a team full of people like you?
If their team is already like this, what choice do they have? It's a prisoners dilemma where everyone else is defecting and I'm the sole cooperator.
IMO the onus for solving this is on the business owner, either through establishing a knowledge sharing culture or more comprehensive performance evaluation that rewards these innovations.
Nice passive aggressive dig!