Do they have a deal with Google/Bing? Any details about this crawler block?
Now a better solution still would be to self-host on a proper project home page.
Gitea is wonderful and definitely something you can host yourself for friends and family. I've even enabled KaTeX rendering in comments/issues/Markdown files on mine, which is something GitHub probably won't do anytime soon.
I'd definitely check it out.
1) Moving a project to GitHub ingratiates them with their puppet masters and generates a lot of billable hours.
2) Once on GitHub, these "developers" keep complicating the commit procedures so that even doc fixes look like a lot of work. More billable hours.
3) GitHub makes it easy to generate green squares for review actions. Merging a PR that another idealistic person put a lot of work in just requires a click. Half of the credit goes to the core developer. It looks as if the core "developer" is doing a lot of work.
4) If you apply the above methods, you will have green GitHub statistics and increase your market value.
pg has written about similar tactics in an essay where he explains why developers love Java. It is sad that open source is now "embraced" to such an extent that the same tactics apply there.
The idealistic developers are not political enough to prevent the bureaucrats from taking over. Also, they do not have time because they are actually writing code.