All major competitions will be in temporary pools from now on. It’s a major spectator sport with growing popularity, but as seen in 2008, 2012, 2016, etc purpose-built facilities for that crowd size are failures.

Paris is swimming in a rugby stadium. It is loud and exciting. The US trials this year were in a temporary pool at the NFL stadium in Indianapolis with 60,000 seats filled! LA 2028 has already announced that they will be using a temporary pool in an NFL stadium and will have 38,000 seats. Brisbane 2032 hasn’t said anything as far as I’ve heard, but you can bet that’s also what they will do.

Edit - I was wrong about LA swimming capacity. It is going to be at the NFL stadium in Inglewood, but as of now they are only aiming for 38,000 seats