Bitbucket Deployments is the first deployment solution that sits next to your source code and can be configured with a single line of code.

I think GitLab already does something very similar: https://docs.gitlab.com/ce/ci/environments.html

…Although it seems to need two lines of config at minimum, so I guess the above statement is technically true. :P

I haven’t used this particular feature of GitLab CI, though, so I can’t directly compare the two.