Certain wasps live underground. So do ground bees. If you happen to have relatively dry soil on a south facing slope, ground bees will take up residence. Both are terribly unfun to disturb with lawmowers.
Either way, getting stung stinks. Getting asked to pay market price for something you used to get for free also stinks, but markets tend to work. If we exclude PDGA and pretend there are 10,000 users as $5/year, the company can afford to lose 6,665 users if they charge more by catering to their most active user base and triple the (annual) price. As someone who got started with his wife with 6 used discs at $5 a pop, 2019 me would be real mad if I used the app. 2021 me does not have the same situation and paid $120 to innova for a dozen cobras. I have what I need and use with TimG's tools and typically use DGCR maps and terrain reading to figure out where the next hole is, but it's more work than looking at an app. If I liked that, I'd probably pay $40-50 a year for it at this point. It may be that they're cleaning house of users who rarely use the app but fill up storage and call for higher server throughput than the dedicated few who would pay better.
Either way (anecdote alert!), it seems like new people I run into know abouth uDisc but not DGCR. Advertising budgets, maybe?