Elaborate!
There are limits on number of cars from each manufacturer to qualify for rebate, I read that Tesla and GM have both passed that limit.
Certainly Musk/Tesla benefitted greatly from rebates early in his production, while other makers did not.
Musk was enjoying the sales benefit of rebates that came out of the pockets of other manufacturers because they weren’t producing enough EVs to satisfy gummint.
Note that credits were for plug-in vehicles, which hybrids were not for several years but Teslas by definition have to be.
Bizarre is California allowing EVs to use HOV lanes, which were set up to reduce number of vehicles on freeways by by motivating multiple occupancy.