Sure, that must be true, but the GitLab and GitHub APIs are not that dissimilar.
Which they address in the later part of their answer which you leave out:
Surely most parts of the project could be reused, but this development would still mean a huge investment, which we can't afford. Nevertheless all kinds of contribution are still welcome and we would try to provide our support as good as we can.
Which they address in the later part of their answer which you leave out:
Surely most parts of the project could be reused, but this development would still mean a huge investment, which we can't afford. Nevertheless all kinds of contribution are still welcome and we would try to provide our support as good as we can.