Why would you assume that the 10% of non standard browsers are going to buy anything?
Demographic is important here. If I was running a shop that sold software for Linux users, sure. If I'm running a store that sells pretty much anything else? I'm not caring.
Why would you expect people using non-standard browsers don't buy things? Presumably they still eat food, wear clothing, and enjoy hobbies.
I'd think that a non-standard browser also strongly suggests that they're a financially-comfortable middle-class individual, and quite possibly a whale with FAANG income.
Demographic is important here. If I was running a shop that sold software for Linux users, sure. If I'm running a store that sells pretty much anything else? I'm not caring.