Afterpay roll into a new merchant, cannibalise existing payment systems and at leat for the low margin merchants I work with, who are not savvy enough to look at their own sales data, their business becomes less profitable.
Their whole business model is deeply unethical IMO, harms merchants and harms customers who do not use Afterpay as merchants have to amortize cost of business across all their customers. The Australian regulator dropper the ball last year when considering legislation to align Afterpay with credit card instruments on this issue. Eventually regulators will realise this is harmful behaviour and align things correctly.