It’s half exaggerated and half true.
Last year, there was some breakdown of Mozilla earnings circulating on the web and I vaguely remember them gaining like 600 or 800 millions (mostly from Google) while only spending something around 200 millions for software dev, and this was in 2022 (their revenue from Google increases each year for some reason). That’s 33% to 25%, so it’s either 66% or 75% of Mozilla revenue used for god knows what.
Thanks for sharing!