Just that git (w/o the central hosting/PR concept/issues) is the total opposite than proprietary, and despite the popularity of the social network GitHub (because that what it is) the market for hosting git repos is very active. Look at Gitlab, Bitbucket, Azure Repos, AWS, ... which are all just fine.
I agree however with the fact that it is a pity to rely on a single tech which is not even the best of breed.