A firesafe in a friend or relative's basement is a much better choice. Safety deposit boxes regularly get lost, tossed, or sold and the banks have very little liabilty.
https://www.nytimes.com/2019/07/19/business/safe-deposit-box...
Yes, safe deposit boxes are not always as safe as spy movies would have you think (or even that we should assume them to reasonably be), but they can still be used as part of a disaster recovery strategy.
The article addresses these options and why they are not ideal either.
Also, one thought experiment I just came up with: how many of your friends are you willing to let store their pendrives in your basement's firesafe? How often would you be comfortable with your friends coming to your home to update their pendrives?
Pendrives aren't known for storing particularly well over the long term so they probably aren't a great choice anyway.
I already have multiple friends who have copies of my house key held in case something really stupid happens, none of whom found that weird and all of whom I'm willing to trust enough that I believe the risk of having multiple such copies extant but unmarked is significantly less than the risk of not having that fallback plan.
In fact, they all considered "being one of the spare key holders" to be an honour more than anything else.
I am very much aware that there are many people whose situations are very different than mine, but it works for me (and they're all wonderful people for whose existence I try to be appropriately grateful.)