Storage is cheap enough that rather than deleting 1000's of photos and never be able to reclaim or look at them again I'd rather buy another drive. I'd rather have a RAW of an 8 year old photo that I overlooked and decide I really like and want to edit/work with than a 87kb resized and compressed JPG of the same file. Same for a mostly-edited 240GB video file. What if I want or need to make some changes to it in the future? May as well hold onto it than have to re-edit the video or re-shoot the video if the original footage was also deleted.
Content creators have deleted their content often enough that if I enjoyed a video and think future me might enjoy rewatching the video - I download it rather than trust that I can still watch it in the future. Sites have been taken offline frequently enough that I download things. News sites keep restructuring and breaking all their old article links so I download the articles locally. JP artists are notorious for deleting their entire accounts and restarting under a new alias that I routinely archive entire Pixiv/Twitter accounts if I like their art as there is no guarantee it will still be there to enjoy the next day.
It all adds up and I'm approaching 2 million well-organized and (mostly) tagged media files in my Hydrus client [0]. I have many scripts to automate downloading and tagging content for these purposes. I very, very rarely delete things. My most frequent reason for deleting anything is "found in higher quality" which conceptually isn't really deleting.
Until storage costs become unreasonable I don't see my habits changing anytime soon. On the contrary - storage keeps getting cheaper and cheaper and new formats keep getting created to encode data more and more efficiently.
I have a Nikon Z8 that can output up to 8.3K @ 60 fps raw video, and my biggest project is just 1 TB! Most are on the order of 20 GB, if that.