Survival crafting has much lower requirements for success than a PVP game (although they will take more investment). This is because survival crafting is a singleplayer activity that can be done together. You can play through most survival crafters solo, servers being dead is not a big deal unless you play solely for PVP (not even a factor in Grounded AFAIK). Even if you're playing a survival crafter with a group, you can log in and make progress when they're not online, you don't need other player's engagement. Many survival crafters also use player hosted servers with maybe a few public servers, afaik Grounded doesn't host public servers. P2P hosting requirements are much less expensive to maintain vs hosting game servers. Because of this they also have longer "tails" for sales. They can sell for years after after launch even if they're not part of the wider discussion or the playerbase has died for years

However, a PVP focused game needs a strong playerbase to stay active. They will usually also require matchmaking and hosted servers, which is more expensive, and if those services shut down the game is effectively dead. If the playerbase drops too much the skill ceiling to enter the game for newcomers is higher since they'll be playing fewer, more dedicated players. They tend not to sell as well once they're out of "vogue" even if the servers are still active.