Pretty much as mentioned upthread; "things change", and time being a factor. You find other things to fill your time, and with enough activities, something's gotta give. In the realm of video games (vg), I've done this myself, quite a bit...I have an Xbox One X and a Nintendo Switch and I haven't turned on my switch in 8 months and i'll play a round or two of Halo 5 a week on my One X. Gaming used to be everything to me and now I can barely play anything. I desperately want to be interested in gaming it just isn't much fun for me anymore. I'm not even excited for Luigi's Mansion 3 which I was in love with the other two. I'm 25 by the way.
I used to be into emulators. I still have them, but haven't really touched them due to a combo of other things (vg and not), and being too lazy to set them up. I ended up getting a Wii around 2007. Played it a lot back then, then stopped. I picked up up about 5 years ago, going through Super Mario Galaxy 1 & 2, then stopped (again).
Then I played a lot of games for PC/Steam. I got a new computer, but never got around to reinstalling Steam. When I got a new 9th gen iPad, it came with a free trial of Apple Arcade, and have been entrenched into that. My AA sub expired and I didn't renew. It was fun and I'm likely to renew it at some point. However, I'm happy for now in taking a break from it. I also got travel and other busy stuff coming up, so timing is good in that regard.
Nowadays I play a game or 3 of StarCraft 2's Coop mode every night (so roughly 20 minutes to 1.5 hours), on top of playing 3 to 6 hours of Switch per week.
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Another big part is SS (streaming services). I did discounted promo (or even free) rates for them (e.g. Hulu, Disney+, Paramount Plus, Apple TV+). I've been going through several of them due to the timing I get them deals, but the variety has been nice. However, after my Amazon prime expires next month, I won't renew. From that point on, I'll only have one SS at a time. Saving the $$ is nice (even though it's not significant), but really, time is the bottleneck.