GitLab was the first code host to add more products (CI, security, ops, helpdesk, analytics, etc.) and create a whole suite, and GitHub followed. GitLab also built for the enterprise years before GitHub started to give appropriate love to the enterprise. Some people think that GitLab is a GitHub clone. Quite the opposite!
Even if you don't use GitLab yourself, you've been a huge beneficiary of the dev workflow GitLab envisioned and created, and of the competition they've given to Microsoft/GitHub. Competition in this space makes everything better.