Why are the "prop firms" removing 'unlimited time'?

Why are the "prop firms" removing 'unlimited time'?
Photo by Djim Loic / Unsplash

The problem is actually pretty simple, when the “prop firms” started offering unlimited time they were still using MetaTrader. Then they had to switch to things like DXtrade, cTrader, and Match Trade but these platforms charge a monthly license fee for each account.