Looks like they are opening PRs to a lot of projects.
Most projects do not even care about the arch they are running on.
Feels like a really strange way to test your own arch. Instead of having a test suite, using other projects to test it for you.https://github.com/search?p=1&q=ppc64le+travis&type=Issues
for example:
https://github.com/watson/ci-info/pull/54