>I haven’t heard of the same attacks facing (for instance) niche hobby communities. Does anyone know if those sites are facing the same scale of attacks?

They are. I participate in modding communities for very niche gaming projects. All of them experienced massive DDOS attacks from AI scrappers on their websites over the past year. They are long running non-commercial projects that don’t present any business interest to anyone to be worth expending resources purely to bring them offline. They had to temporarily put the majority of their discussion boards and development resources behind a login wall to avoid having to go down completely.