Kicking the poors while they're down and/or pulling the rug out from under people who are just barely doing better is not a sustainable way of decarbonizing society and it seems like every decarbonizing policy does just that. We can get away with a few such policies but when they're all like that it doesn't work.
It's not the same use case and in congested places like central Paris people who need a motor have scooters.
Feedback stats on these schemes are important but rarely conducted or published in a transparent way as the government obviously has a vested interest in claiming that they work great.
I am sure some people will use the scheme but probably because they were thinking of getting an ebike anyway and a replacing their car for a new one...
It's the usual and main issue with those schemes: they are political decisions and don't always make practical or economical sense.