Can I imagine a venue kicking out 2% of their former clients on some criteria? Absolutely yes.
Kicking out 2% of website visitors may still be totally reasonable if the cost to serve them is meaningful, or if they are less than 2% of revenue.
His defense for 98% being bad is that some CSS thing people were arguing about only had 70% coverage on his website.
Our b2b dashboard didn't support Safari for a while at all and it was entirely not an issue because everyone had a simple workaround to just use Chrome and the dashboard wasn't really the main product.