Not only Acinq, but many other public nodes.
Here is Rene Pickhardt method about "valve system" in LN, very interesting study that I tested myself (see my experiment guide about fees)

https://blog.bitmex.com/the-power-of-htlc_maximum_msat-as-a-control-valve-for-better-flow-control-improved-reliability-and-lower-expected-payment-failure-rates-on-the-lightning-network/