Earlier quoted context omitted.
Ferrari is currently #6 out of 10 teams so whatever they're spending it's not working. https://www.formula1.com/en/results.html/2020/team.html
For those who are not following - Ferrari "cheated" last year with their engine and have a secret "agreement" with FIA to cut out thr cheat which also meant apparently rebuilding a lot of the PU. They should be back on pace in 2022.
The engineers on the payroll at the FIA don't have the time/resources/knowledge to judge the legality of these insanely complex powertrains.
All manufacturers were forced earlier this year to provide detailed info about their Energy Recovery Systems, rumors are that Ferrari suspects the Mercedes ERS to make use of loopholes so Ferrari lends their engineers to the FIA to research the data provided on all engines.
Close some of those loopholes with a Technical Directive (Basically a clarification of the rules, which takes immediate effect) and you can slow down your opponents with immediately.