I think you logged in to TMDPVP-1 or TMDPVE-1, they removed Infinite Money on these 2 servers because this is the server where most of the new players can play without being insta-killed by OG's and yeah, they just want TMDPVP-1 and TMDPVE-1 more than just full PVP where you can get killed and buy all your items back without losing any money.
If you want to use your Infinite Money, you can use it on TMDC-1, that's the only place where you can still use it.