Tip inflation – or tip creep – is not a new phenomenon: https://www.reuters.com/article/us-money-retail-tipping-idUSKBN1962D3 or https://www.businessinsider.com/avoid-paying-gratuity-for-bad-service-2013-1
But it's been exasperated by high inflation at the moment: https://blog.aerofund.com/tip-inflation
Lots of conversations are happening on social media, where examples are shared: https://www.reddit.com/r/mildlyinfuriating/comments/wvvox3/am_i_supposed_to_feel_like_a_cheap_ass_for_only/ or https://www.boredpanda.com/pizza-delivery-driver-gets-low-tip-900-dollar-order/
It is also trending internationally: https://globalnews.ca/news/9087894/tip-inflation-canada/
Data on the issue is hard to come by: https://talkradionews.com/tipping-statistics-23-interesting-facts-trends-statistics/
Yes, complaining about it makes you look like an old cheapskate: https://lenpenzo.com/blog/id1351-tip-inflation-blame-2.html or https://uk.netblogpro.com/commentisfree/2015/feb/06/coffe-shops-tip-inflation-stingy-millennials
Tipping on takeout is now expected: https://www.vox.com/recode/2022/10/7/23389885/square-toast-tipping-retail-tipflation-guilt or https://www.reddit.com/r/AskNYC/comments/ri4lxc/is_tipping_required_for_takeout_orders/