This kind of question comes up in many areas. And which software you use is less critical compared to politics. Of course you can use google and advocate foss, if your question is to be taken literally. It would not be the best thing you could do, but what would even be the best thing? Using software is not helping anyone (exept for software that takes your data or mines crypto while you use it or something). You would need to donate, contribute or bring people to do these things to really help the software/devs. Use which software/service you are comfortable with using.