There is no dev tax in Monero. Development is funded by voluntary donations (https://ccs.getmonero.org/).

Monero development is discussed publicly (https://matrix.to/#/#monero-dev:monero.social, https://matrix.to/#/#monero-community:monero.social) and anyone can contribute. Hard forks are discussed, planned and tested and notice is given months in advance. If you don't like a planned feature in the hard fork, you can openly discuss it in a monero-dev or monero-community meeting. Wallet updates are also released weeks in advance.

The 0.6 XMR/block tail emission trends toward 0% inflation over time (disinflationary). Right now the annual inflation is around 0.87%, which is currently less than Bitcoin and gold, and far less than fiat. The tail emission incentivizes miners (less risk of a fee market, considering that the Bitcoin block reward will drop below 1 BTC in 2032 and to 0.01 BTC in 2056) and means that it will always be possible to acquire Monero via CPU mining, which is an accessible KYC-free on-ramp (you just need a regular computer to mine Monero). The tail emission was included in the original Monero code from 2014 and became active this year. More details in this infographic:

Monero's supply is verified via range-proofs (cryptography that ensures that inputs - outputs = 0, without disclosing exact amounts). Nodes verify range-proofs for every transaction and will reject invalid TXs. Block rewards from mining are transparent and can be viewed on any block explorer. In addition, a developer is writing a script to externally audit the supply via Python: https://ccs.getmonero.org/proposals/monero-inflation-checker.html