I am well aware of coins with controlled inflation like BTC, where a finite number of coins will be generated at a controlled rate. Very recently I came across deflationary tokens where coins are destroyed whenever a transaction is made and they will end at some time.
My question is what is the purpose of creating such coins? Are they worthy enough to be invested ?
To be honest with you, most deflationary coins are simply not worth the investment. Only a small few like Bitcoin, ETC, and Maker DAO, are worth a shot. This is largely because value doesn't necessarily come from deflation, but rather usability. If a cryptocurrency or token is deflationary but has no real use cases for the mainstream world, it'll simply become worthless in the long run. BNB is another deflationary token in which Binance burns a portion of its supply every once in a while. Besides this, the token is widely used on the Binance exchange for fee discounts, token creation on Binance Chain, and more. As it combines deflation + utility, it has managed to obtain a relatively high price on the market.
If you pick the right tokens that are deflationary by design, your investment will grow by a large margin over time. Bitcoin is well-known to be the best deflationary cryptocurrency you can invest right now. By playing your cards right, you'll be able to live a steady financial life for the foreseeable future. Remember, "not all that glitters is Gold". Just my thoughts