Not blaming the victim, but at this point most of Google services have not shown to be reliable, especially if you require some kind of thinking human behind a decision
If you are a rebel in a contested part of the world, submitting videos to youtube takes literally 2 clicks on any cheapest android phone, and then the entire world can watch it. Everything else requires at least a bit of technical expertise which you might not have.
There is probably someone in that 'entire world watching it' who has the time and technical expertise to help make backups. If nobody else knows about it, then it wasn't going to be used for evidence of anything anyway.
If you submit a video to google drive and start giving people links then it will be very promptly disabled with a warning that if you want to share it you need to upload it to youtube. Same with OneDrive/Dropbox. It's fine to share with a few people, but go into hundreds and it gets quickly shut down.
Not blaming the victim, but at this point most of Google services have not shown to be reliable, especially if you require some kind of thinking human behind a decision