LONDON (Reuters Breakingviews) - Fintech disruptors are starting to get disrupted. Afterpay, an $18 billion Australian “buy now pay later” company, has lost about 10% of its market value after U.S. payments giant PayPal said it would offer similar products. The faster this funky form of credit grows, the more competition - and regulation – it will attract. Buy now pay later groups let customers get goods upfront but pay for them over time in interest-free instalments. Shoppers only go through...