Google pushed Chrome hard for years on its sites, it's true. It used to be suggested at the footer of every Youtube results page ~10 years ago, be suggested at the top when you visited Google search, Gmail, Translate, etc. It'd pester Firefox users by saying it's better and ironically even users using Chromium forks which it's based upon.

IIRC some Firefox devs also accused them of tweaking sites like Youtube in particular ways that only affected competing browsers and made performance worse comparatively.