Calabria is home of Ndrangheta https://www.interpol.int/en/Crimes/Organized-crime/Projects/...
Ndrangheta is a huge criminal organization with ties to politics and a lot of economic power and it is based in Calabria.
The current government actively proposed special antimafia rules for checking contractors and subcontractors for the bridge which, IMHO, reinforce the idea that it is a gift to mafia. Luckily the proposal was rejected by the president https://en.ilsole24ore.com/art/strait-bridge-no-derogation-a...
We already had issues with ndrangheta and infrastructures for example https://transparency.eu/the-eternally-unfinished-highway/ or https://en.m.wikipedia.org/wiki/Gioia_Tauro
All of this only on one side of the bridge, on the other you have Sicily.
I think that there are reasonable doubts about mafia interference with the construction of the bridge.
There are many suspects that criminal organisations are involved in the actual ferry management:
https://lespresso.it/c/attualita/2021/2/23/cosi-la-mafia-con...
Whit your mindset we need to stop them as well