I realize that basketball is another animal and it is common for kids to transfer schools regularly. This amendment is aimed at HS Basketball.
We all have seen kids transfer once, likely to put themselves on a better team with the hope of getting noticed by college recruiters.
Although extremely rare, I have seen kids transfer twice over 4 years. He, or his father, are likely looking for playing time the kid is not getting at his prior schools. That story doesn't end well.
I can't imagine a kid transferring 3 times in 4 years seeking to play on a 4 different HS football teams.