Everyone (especially content creators), as of May 1st, 2020. Any Youtube video that's older than 6 years will have their bitrate reduced to conserve data bits on Youtube. So if you have a video that's 720p as 8mbps, it'll lower down to 4mbps.
Remember those DOA5U videos with those uploaders back on PS3/360 with 480p? it'll be from 4mbps to 2mbps. Basically even shittier quality.