https://www.potaroo.net/bgpupds/reports/v6-bgpupd.html
These reports have been going on for a couple of decades now. It operates over a rolling 14 day window.
Over the last 14 days in IPv4 the noisiest 50 prefixes generate 5% of the total update load, The 50 noisiest Origin AS's generate 24% of the total 14-day BGP update load
The same has been going on in IPv6. The 50 noisiest prefixes (and a whole bunch of them originate in Akamai) generate a whopping 34% of the total IPv6 update load, and the noisiest 50 Origin AS's generate an even more impressive 74% of the total IpPv6 update load. Akamai's AS 36813 generated 27% of total IPv6 update load over the past 14 days.
(There are 40,300 30 second MRAI intervals in a 14 day period so when a prefix is being updated 33,000 times in 145 days its basically being updated as fast as many BGP implementations will let you!)
Geoff