What is the real cost of all this 'free' money?

In this era of ultra-low, or even negative, borrowing costs, it's easy to see why governments are so willing to borrow unimaginable quantities of 'free' money to fund their spending ambitions. https://www.dailymail.co.uk/money/comment/article-9265963/What-real-cost-free-money.html?ns_mchannel=rss&ns_campaign=1490&ito=1490