[toper-centage]

Unfortunately, github is 50% git, 50% proprietary code that you don't control and can't neatly export your data for other platforms. All these git hosts are walled Gardens. It's a sad state of affairs but not really limited to git (Gmail walled Garden despite email standard, messaging apps, etc).

[grumple]

Github has some great management tools for reviewing code and integrating with various integrations. But so does Gitlab, Bitbucket... and I'm sure there are more. They aren't 1 for 1 replacements, but they do exist. I'd personally recommend against using a ton of integrations that tightly bound you to any service.

[toper-centage]

Yes, they all have great tools on top of git, but they are all different and hard to transfer between platforms.