How about removing your gem from rubygems?

[KevinBongart]

I agree with you that gem install bundle is annoying, but it would be less so if the user got an error about the gem not being found rather than the standard "installed" message.

[tom-lord]

I think a better solution would be to add a post-install message, explaining what had just happened.

For example, a warning about which version of bundle you installed would be nice. At the time of writing this:
gem install bundle --> installs bundler-1.8.0.pre
gem install bundler --> installs bundler-1.7.13

[nkgm]

What's wrong with letting people realize it's bundler and not taking away their chance to learn it properly? The existence of this gem is more confusing than anything else.

[tlunter]

Agreed with this. Was installing bundle and it was installing 1.11 beta 2 which was causing all sorts of problems.

[tom-jin]

An error message would be more useful than this package.
If someone is mistakenly trying to update bundler by running gem install bundle the package is not updated when bundle is installed.

[michaelkirk]

Better that this gem exists than something malicious with the same name.

https://news.ycombinator.com/item?id=11862217