My guess is that PayPal et al don't particularly care - the onus is on the bitcoin user (i.e. the consumer) to calculate capital gains, report to the IRS etc.

My guess is that PayPal et al don't particularly care - the onus is on the bitcoin user (i.e. the consumer) to calculate capital gains, report to the IRS etc. Those consumers probably don't care - they'll wait to see how/if the IRS actually has a willingness/ability to enforce their own guidelines...