People look at the cost of properly storing the data without thinking of the cost of not doing it.
A team I was helping with was in charge of making a lot of training videos which were then used in paid classes. Several employees working at least 4 days a week shooting and editing videos. They had been keeping all their master copies on the same memory cards they used in their cameras, "backups are too expensive!". Then one of their memory cards corrupted, and I asked them to calculate the amount of salary went in to making the data on that flash card.
That afternoon a NAS was delivered with authorization to backup that to separate cloud services. Suddenly when they bothered to have that perspective the cost of a NAS was dirt cheap despite being way too expensive days before.
If you weren't a mechanic, you wouldn't avoid maintaining a car and then get upset that it broke down eventually, you would pay a specialist to maintain it for you.
Youtube is cool because it's "free" but you also get almost zero support from Google and they are pretty the worst in my opinion. I have got decent support from AWS and Microsoft (never tried with FB).
But tbh I think even getting and external drive and backing up to it should at least be done in parallel to any cloud service you choose.
If youtube deletes your account, you take the drives out of the closet and re-upload. If a drive fails, you use youtube-dl to repopulate it.
The only way this fails is if a drive dies / house fire on the same day that youtube deletes your account. If you are really that paranoid about it, keep a second copy of each drive at work / home. But you really, really don't need to.