Yeah, the main problem is that when Saudis build a Mosque only their Imams are allowed to preach in them and these are from a different branch of Islam.
Kinda like if a bunch of Orthodox Christians were seeking refuge in a faraway land and Catholic Church would declare that they will build a church for them. ...Except that only Catholic priests are allowed to preach in the church. ...Actually you could replace Catholics with (incredibly rich in this fictional scenario) Westoro Baptist Church...