They don't have any votes to give - other than their 2. You are probably thinking about delegates, as in Biden releasing his delegates to vote for her. Since they are running as Independents they have no delegates, and it is a different party anyway.
They could ask their voters to vote Trump and he would get some percentage - who knows how many? They probably supported RFKJR because they couldn't support Biden, but Kamala gives them an out to avoid voting for Trump.
Be better if they sayed in and endorsed trump too.
Could they stay in and then give their votes to Trump? Is that legal?
They don't have any votes to give - other than their 2. You are probably thinking about delegates, as in Biden releasing his delegates to vote for her. Since they are running as Independents they have no delegates, and it is a different party anyway.
They could ask their voters to vote Trump and he would get some percentage - who knows how many? They probably supported RFKJR because they couldn't support Biden, but Kamala gives them an out to avoid voting for Trump.