As a hearing-impaired person, I just wanted to thank you for clearly mentioning that it's subtitled. That shows it's more than just an afterthought, and seals the deal for me!
It's good to hear this too, because the text in that box originally said 'Filmed in 4K' and I only changed it to 'Fully subtitled' at the last moment.
But their web site says $7.50/minute for subtitling, $1 for transcriptions.
Still may be quite reasonable to extend video reach that much.
Have captions on your video for everyone, not just the deaf people in your audience (unless you just really love the sound of your own voice so much that you want to force other people to suffer through it).
But it's not free. Either it's worth it or you are a good doer.