Grin is still a thing. They still have a small but active community and developers that are working. The overall crack on privacy based coins had an effect on the price and adoption of GRIN coin on exchanges and among people. Grin rose to a high price where there was hype about the privacy coins but has now settled in a much lower price range which actually is the natural price for it. It could still be a good coin to invest in as the hype on privacy focused coin may return.
Biggest problem with Grin is its inflation, very high inflation. It is affected by general break down on privacy coins but it bas its own problems.
In first several years, Grin coin is very inflationary and it is very natural to see its price affected by this. It seems the coin supply curve will enter a flatter area next two years.
Inflation will ensure a general downward price trend for at least the first year, I'd expect, and it becomes sort-of reasonable only after 4 years. Will grin survive that long? Not sure. If you think it will, then it might make sense to buy grin at very cheap prices in its first few years, and this thinking could perhaps stabilize the market somewhat.
Grin inflation rates| Year # | Yearly monetary inflation rate |
| 1 | 36500% |
| 2 | 100% |
| 3 | 50% |
| 4 | 33% |
| 5 | 25% |
| 6 | 20% |
| 7 | 17% |
| 8 | 14% |
| 11 | 10% |
| 21 | 5% |
| 34 | 3% |
I started mining grin on a gpu about a year ago, and now I have five g1 minis running. The thing I love most about grin is the supply curve and the distribution in general. There is no more fair launch in cryptocurrency, not even bitcoin, and it's not even close. Besides that it is more lightweight than bitcoin and more private.