[brokencube]

It wouldn't be suitable for any application where you care about GDPR (i.e. you store personal information and have users in the EU)

The "right to be forgotten" is not compatible with immutable data. You can't simply need to mark data as deleted, you need to 'purge' it from your system (and possible backups, depending on how long you keep historic backups) - that isn't possible in a system with immutable data.

[blablabla123]

I mean there are solutions for this. About CQRS/Event sourcing I've read that it's possible to solve it by encrypting the data with different keys and then rotating/throwing away the keys every now and then. Seems a bit hacky but probably there are more elegant approaches.