https://www.mlbtraderumors.com/2023/11/spencer-turnbull-awarded-full-year-of-service-for-2023.html
..."That is important for Turnbull on a couple of fronts. For one, players with more than five years of service can’t be optioned to the minors without their consent. Prior to this ruling, Turnbull was still going to have an option year remaining in 2024, allowing a club to sign him but keep him as depth in the minors in they wanted. That will no longer be on the table. Secondly, if Turnbull eventually spends all of 2024 in the majors or on the IL, he will get beyond six years of service and qualify for free agency again. Prior to today’s change, a club could have theoretically signed him for 2024 and then retained him via arbitration for 2025, since Turnbull would have been just shy of six years in that scenario. All in all, Turnbull has gained some more control over his future than he would have otherwise had."...