Until February 2020, when a satellite on orbit ran out of propellant, that was the end of its life. Most major communications and military satellites are designed with prolonged lifetimes and carry enough fuel for a 15 year mission.
But the struggle for some satellite operators has been that at the end of that 15 year period, satellites running out of fuel are still working perfectly well in every other regard. Therefore, perfectly good satellites have to be decommissioned. But not anymore.