There are lots of fine folks out there who create art, photographs, music, games, words, pictures, sculptures, graphic designs and designs for things.
If someone creates a fresh piece of work - then they own the copyright to it - no ifs, no buts.
In nearly all countries - USA, UK and EU included - you do not have the right to copy something - even if it is only for your personal use.
If you are one of above listed creators you already know how hard it is to make a living without people stealing your work.
If you are not normally creator - imagine someone stealing straight out of your pay packet. Might only be a few dollars, but every time you copy someone else’s work that is what you are doing.
I know this is boring and irritating and “what harm am I doing” - but I am a games designer, writer, photographer and I can tell you that when your work is stolen - it hurts - both mentally and financially.
So, if you like someones work then
(a) reach out to them and ask for permission, offer money - if it is just for your own use
(b) negotiate a licence if it is for multiple use or commercial use
© be inspired and create your own - but credit the inspiration