It's more relief than smugness. Gyms always seemed to let me down: onerous contracts, complex or buggy booking platforms/procedures, unhygienic, stuffy, rigid class start times and open hours. Gaining self-sufficiency made me incredibly happy/relieved.
The final straw was when I wanted to pause the membership the gym required "supporting documentation" (i.e. flight or hotel itinerary). I cringed so hard. When I cancelled they charged 2 weeks because that's just normal. Stripe and apple subscriptions let you finish your currently billing period when you cancel, but certainly don't charge you for the next 2 billing periods. I found it so backward. Charging people for what they're clearly not using is kinda sleazy IMO (I know the article sheds light on why gyms do that - that's how they make most their money!)
Also, at least half of the utility of exercise for me is mental (as opposed to physical). So clicking on poorly made apps and dealing with contracts was the opposite effect I was hoping to experience, meanwhile breathing fresh air in nature while working out is very mentally relaxing and pleasant.
Tl;dr I got bitten a bunch of times by super lame or unnecessarily onerous gym processes, hence why becoming self sufficient made me so happy.