Yeah, you’re seeing it in other sports. Little Jenny is not starting her Freshman year so she looks to transfer. Or maybe Jenny paid her dues and finally became a starter her junior year, only to be back on the bench as the team brought in 4 new transfers. The portal is a game changer. It can help kids too though. If you don’t like the school, coach, team or whatever, it’s much easier to transfer somewhere else. A double edged sword for sure.
You also need to remember that most of the higher-academic schools like Duke,UNC,ND and even BC have pretty high restriction on non-grad transfers. These schools can lose kids but relly can't add them, except for grad transfers