Once you've purchased LUT's, you can use it as long as you want, you don’t have to pay for them monthly and it's yours forever!
Please not that 123presets LUT's are copyrighted. The license you buy is a single purchaser license. It license does not extend to companies or partnerships and may not be resold (whole or modified, reversed-engineered), loaned, and/or gifted to another individual and/or party.