Without digging too far into the weeds, Tech and Attucks have become destinations because their coaching staffs welcome transfers. Attucks has also had a tremendous amount of success recently. Tech won the title with Trey Lyles.
If transferring is being done legally by IHSAA rules, there's not much I say about it. This is happening all over the area, and some schools are open to it. Others are less open to it, but it's happening in every sport.
If it's not being done by the book, it's up to people to prove that. All I know is that you have kids playing at different schools in Marion County for all four of their years in school sometimes.