Instead of antivirus or antimalware software, I use several tools from Objective-See. They’re free and open source. Company founder Patrick Wardle is making the business a non-profit.
I see a lot of people who take VC money and almost always your business model has to change or you have to put profits first and can’t do the community focus and public service activities you want. Going the nonprofit route is a really good approach and illustrates that you can support your company on donations without having to change that business model.