It might depend on local election law. If we’re realistic this had the effect of vote buying. They wouldn’t do it otherwise
No argument from me there!
But it is not vote-buying.
If I volunteer to drive my one (old and feeble) cousin (a staunch Republican) to the polling place - but refuse to assist my other (handicapped) cousin (a dyed-in-the-wool Democrat) to the polling place, I have effectively given the Republicans an extra vote, while simultaneously denying the Democrats a vote.
This is legal - and it is impossible to prove that I intended to influence the outcome of the election (I could argue that I wasn't able to ferry both to the polls, so flipped a coin - and the results "happened" to favor the right-leaning cousin).
Regards,