They’re not. Some buy a Verified Mark Certificate (e.g. ikea.{com, ca, fr, maybe others} do), but most won’t ever (e.g. the first one on https://bimi-explorer.svg.zone/bimi/list.html 026430010.co.il, and a slightly random other dailydot.com). Also the two Mark Verifying Authorities listed at https://bimigroup.org/implementation-guide/ currently talk about approximately $1,300 and $1,600 per year, less than the $2,000 you say though recurring.
Also, a good source of official SVG logos is BIMI, a standard that uses DNS to point to the URL of an SVG.
Spec: https://bimigroup.org/
I recently scraped them for the top N domains: https://bimi-explorer.svg.zone/bimi/