I haven't had a reason to do a mass transfer from Chase, but that day may be coming. "Historically" I'd planned to use Chase points to transfer to SQ (or possibly BA, depending on the exact situation), but the pandemic blew all of that up (I haven't had a reason to fly overseas since 2019, and a specific planned use of points/miles for late in 2020 [helping family attend a wedding in India] didn't materialize so I've ended up with some larger-than-planned balances floating around in various places).