Just read an article on Apple and Sumsung (which I was surprised at).I knew apple were doing it as even my very old samsung could open 2 or 3 pages before my iphone. It was for that reason why I jumped ship as I wasn't going to pay a fortune for a new phone.
I am so glad they have been fined as it is just so wrong , there is nothing wrong with keeping a phone for a few years
Article
https://www.uswitch.com/mobiles/news/2018/10/apple-and-samsung-fined-for-slowing-down-their-phones/