The idea that there is no ordination nowadays is well known in the Gemara. But I admit that I forget the exact source. The fact that there is no ordination outside of Israel is however in Sanhedrin page 14.
This is brought in Bava Kama around page 84 where the issue of things that can be judged outside of Israel comes up. חבלות והודעות.
Why it seems necessary to mention this is that this is one area that is rarely touched upon by religious authorities that want to pull the wool over people's eyes to make them think that they have actual ordination. In that way they monetize Torah. [I.e., they use Torah as a means to make money and gain prestige and power.]
This is brought in Bava Kama around page 84 where the issue of things that can be judged outside of Israel comes up. חבלות והודעות.
Why it seems necessary to mention this is that this is one area that is rarely touched upon by religious authorities that want to pull the wool over people's eyes to make them think that they have actual ordination. In that way they monetize Torah. [I.e., they use Torah as a means to make money and gain prestige and power.]
A different issue is that in any case, it is forbidden to use Torah to make money. And that Rambam about the Tribe of Levi has nothing to do with this issue because there the Rambam says for one that accepts on himself the yoke of serving God, God will provide. He say nothing there in relation to the question of one can use Torah to make money. [And the question of using Torah to make money is dealt with by the Rambam in a different place, i.e., laws of learning Torah.]