When I first heard of it, I imediately suspected greenwashing.

I would suggest flatfox.ch because it's free to advertise unlike homegate and anibis.

In my understanding fail2ban will block ips if they are detected to do brutforce or use known exploits.

Crowdsec will share this IP via a blocklist to all subscribte systems. You will benefit form the detection of other systems and not only your own.

I can recommend the video The science of catching up in life

I am with sunrise. By default i had a ipv6 adress and thus could not use portforwarding but after a call they changed it.