It's nice that people want to keep things free and to avoid the influence that money might bring to a thing. But the unfortunate reality is that we live in a society that doesn't let me buy groceries, beer or housing with goodwill. Sure, help is a good thing, and I'm the last person who wants to live in a society where our interactions are commoditized. But there's a cost for the convenience of near-instantly beaming that help to your phone/desktop/smart glasses. Put simply, I'm just as much a consumer as are you, and I think that regarding services like these as something that should be given away for free is a big reason there's next to zero innovation in how I as a blind person interact with my world.
Put more practically, I've probably spent ~$100 on audio-only games in the course of my lifetime (would likely be more, I'm just not a huge gamer.) Additionally, I've purchased Twitter clients, book readers and other apps specifically designed to be highly accessible because their mainstream equivalents aren't, or their accessibility implementations are laughably bad (see Kindle for PC, which I'd rather crack Kindle content than use.) We're here, we're buying things, and while there's certainly a large segment of the community that will vocally complain if things aren't free, we're happy to fund new innovation for folks who can deliver something beyond another currency/color identifier or minor screen reader iteration.