...how do you mean?
Obviously we're not going to get everyone to download a FOSS period tracker, as nice as that would be -- they're already invested in the ones they're using, and no doubt it will have features and usability improvements the FOSS one doesn't, usually thanks to some network service that is fundamentally incompatible with the FOSS philosophy. That's almost always how these things go.
We should definitely be telling more people about F-Droid, but let's not get our hopes up. Socialism is about protecting everyone, even people who don't share your views, even if those views are objectively correct.
What do you get out of throwing trans people under the bus because you didn't want your own feelings to be hurt?