The main problem for Antony was already not being able to find much chance at Manchester United. Therefore Real Betis has been the best option for him.
I bet Bayern Munich wasn't even thinking of doing so.

They were going to use him as a rotational player there too. How can he cut Luis Díaz or Olise in the end?
This is the most sensible signing for Real Betis considering his contribution to the team so far.