Im no expert, but will share my experience. I used to host (2 years) on rpi4 4GB and can’t recommend because it was painfull with USB drives. It works fine for many peeps, but I ended up using it as 2nd DNS server.

Eventually I built DIY desktop PC (a year ago) with celeron G3930 (with quick sync) and no GPU. Runs perfectly fine for multiple 1080p streams, but I never tried 4k. Its dirt cheap hardware and its much better than rpi (imo) because it has sata ports. It runs 30-40 services ans drains around 30W (with 2 SSDs and 1 HDD) from the wall