Interesting, so your setup cost you 0€ and make you 10k/€ montly?
Anty-dolphin costs $0. The rest is very expensive, including alternative costs like work hours and so on.
If you asked someone to build it for you, costs would be probably $50k plus maintenance and updates.
Also someone else won't dabble deep into how things, libraries, APIs and programming languages are built.
If you do something like that for small results, it's a shoot in the foot.
You can build with $0 (but time / learning are more expensive actually), but once you deploy it, it gives 200% - 1000% ROI depending on how patient settings are used.
Slower settings give higher ROI long term. More aggressive settings give money quicker, but require higher input cause you'll need more accounts and proxies.
Things like videos require design of video processing and creation module. The higher quality video and music you want, the slower will be the ideation and development process.
Most people give up once it requires something more than reuploading and they switch to dancing on TikTok trying to promote AI generated cats. <-- This is actually the funny part. When people see something requires 2, 3, 5, 10 years of consistent work, they simply make some absurd assumptions in their head and switch to a so-called "unsaturated market" which in reality is just "easy mode".
So in conclusion you're not building it for money, but money is a side effect of it all. People can't build without passion.
For money go and build something like SaaS. Make something like "Heygen". It's useless product but investors put in the money like crazy due to gold rush.
It's hard to build SaaS at low costs because there's just no drive for things like that. It's like selling stuff. You just want to be done with it. You don't really like it.
SaaS would be pure business and pure business is far from pleasant engineering.
Video production software and automation is closer to game development or something like that where you basically build the reality yourself using graphics using C bindings or C++ itself.