Sure. Dealing with DMCA is costly to companies (how much, I do not know).
Either they pay lawyers to look at requests thoroughly (more time, so cost more), or they don’t and deal with a communication problem when a repo is banned while it shouldn’t and it hit HN. The more repos are on Github, the more likely this will happen. So something that shouldn’t be too costly (hosting a git repos) suddenly either required highly paid lawyers, or intervention from CEO, communications professionals, etc, with also a flow of people to their competitors.
If the system was more distributed, Github would get less DMCA requests (since people would go elsewhere after being kicked too often), or they would be less criticized when a error happen, because it would be less disruptive.
In both cases, that’s a win for Github.
If we do a cost analysis, there is a likely a few repos who are costing more to Github than others for this kind of reasons. Anything that ease migration outside of Github infra would help them, since people with a need to be more DMCA resilient would be hosted elsewhere (like in a country where they care less), and the rest would still go on Github because they do not care about that, and Github can compete on features.