Earlier quoted context omitted.
Irony of ironies. Gitlab's import-from-GitHub functionality has been broken ever since we tried to migrate away. (They're going ot fix it soon.)
I'm sorry you had a bad experience with this. The importer can still get better but we're importing about 500 projects per hour at peak https://www.dropbox.com/s/hr3ndcmu21aehmk/Screenshot%202019-...
I'm generally very pleased with GitLab. I'm delighted that it's open source.