They can show they are an alternative and their TOS would reflect what content will be removed for.. and they could perhaps educate individuals to back up their content or provide back up storage as well.
Depending on one storage company means they don’t even control what happens with the content in the future. They just need to be clear with their users on this.
Many don’t care about decentralization, and that’s total fine.. but I’m not sure how answering the question of “what is a decentralized alternative to YouTube?” With “3speak” is extremely misleading and can hurt content creators long term.