Last year, I was witnessed by many deflationary crypto coins, but right now, I don't see anyone doing good, many projects already scammed, many are dead. Because the idea was bullshit to me. There was no use cases, no future vision on those coins, so they have gone for better! I would suggest you don't invest such self-killing currency, I am regretting by investing in Blockburn though they moved from their Deflationary model!
If you encounter a deflationary token with no use case but there is a promise of increase its price due to decreasing its total supply, don't be tempted to buy.
Because decreasing its supply alone will not guarantee its price increase.
Only the dev team will benefit from it. One should have strong use case to deliver a strong market.
So nope, not all deflationary tokens are worth buying. Most of them are crap tokens trying to rekt buyers.