I agree with you but
Do you envision people doing this manually multiple time per day? Market making should be automatic or we are going back to pre-digital age, there is a lot of literature on it.
Modern marketmakers look at price on other pair and exchanges, twitter feeds, real time orderbooks, news website, volume, velocity, historical records to adjust some parameters of probabilistic models and decide target price… I don’t think any custodian can do this reasonably well multiple time per day, manually.