From The Verge: "Dragalia Lost launched in 2018 as a statement of intent from Nintendo in partnership with Japanese developer Cygames. Nintendo may have first jumped into the field of mobile games in 2016 with the launch of games like Super Mario Run and Miitomo, but this was the first original property the company had produced exclusively for mobile devices. This free-to-play gacha game (a game whose content is generally free to access while charging microtransactions for loot boxes and randomized lotteries for rare and limited-time characters) had a flashy multi-region launch campaign collaborating with major Japanese musician DAOKO, banking on the game’s success at home and abroad.
And it was a hit. Less than a year after launch, the game had already earned over $100 million, with a steady stream of merchandise following soon after. Yet, as of last month, Nintendo and Cygames published the game’s final update, and this week, it was revealed that the game would shut down on November 29th after just three years of operation."
Pretty typical of mobile games, short lifespan, I see them as more as a quick money grab to be discarded once they're stopped racking in the dough (no point continuing to support it if it isn't bringing in a constant stream of cash).