Edit: I meant moving off cloud to Hetzner, Vultr, DigitalOcean.
In the US, that's effectively zero due to the US phone infrastructure largely using a shared-cost model, but in most other countries which use "sender pays", these fees can be significant.
As I have to explain about open source, 'Free is only free if your time is worth nothing.' (And I use a lot of FOSS, it just not always the solution.)
This is the worst take in technology. The main value of FOSS is freedom, not time or money savings. For many people freedom is more valuable than either.
Also, FOSS and managed aren't mutually exclusive.