Monero is FOSS that's all that matters. It's a free market. At any moment if you or the community don't like the direction it is heading you can sell your Monero, swap it for another, or fork off and no one can stop you.
You audit Monero the same way you audit Bitcoin. You run a node then pay no attention so you don't even take advantage of it's transparency and simple math. Typing in a command to tell you total supply doesn't count. Otherwise you are doing exactly what every Monero user is doing. No Bitcoiner is making sure all transactions in 800,000+ blocks total inputs = total outputs. They are *definitely* not doing this every ten minutes.
https://sethforprivacy.com/posts/dispelling-monero-fud/#you-cant-audit-the-monero-supply