How confident are you that the UBI hand out is going to be anywhere near what you made while working?
0.
It doesn't have to be. Social cohesion and not having to work are already major benefits.
UBI is already premised on the fact that top earners will have to give something up if UBI is going to make sense. I've been relatively blessed, but I know no one's future is guaranteed. Thinking one has to only best accrue their own pile in a world of disruption doesn't make sense. Eventually the Bastille gets stormed. Why not get ahead of it and avoid the terror? Why burn the data center?
/me looks at the history of wealth distribution following new labor saving innovations