The trading volume in LocalBitcoins has been declining for a long time, and there is no significant market demand for their service. No company will run a business that is not profitable anymore. So, they had to take this decision.
Localbitcoins lost their trading volume because they used to be a p2p BTC exchange that later began to ask for KYC from their customers, their users were people who wanted to trade only p2p, so obviously trading volume was going to drop, as their customers moved to other BTC p2p exchanges.
whole saga explained in short
when P2P traders become popular. THEIR BANKS see people using personal accounts doing ALOT of wire transfers. much more than normal people do on personal accounts. this triggers banks to flag such accounts and investigate
in many cases those p2p traders had to upgrade to business accounts register as a payment facilitator/money service. which meant requirements of doing KYC
this eventually lead to localbitcoins needing to add this data collection feature
other events where scammers. who would buy bitcoin. and where the scammer would contact their own bank and claim that a hackers accessed their bank and sent some money to a thief. .. thus the scammer got the bitcoin and a fiat refund. and made the btc seller be flagged as a thief
this too caused sellers to want more info on the buyer to prove the buyer was the account holder
..
now here is the thing
DEX platforms are new. so they have yet to hit the scenarios localbitcoin sellers are hit with due to lack of popularity.. however when DEX seller get popular and start doing too many wire transfers or getting scammed and treated as thieves. they too will end up shutting up shop or going official.
thus DEX wont change things, its just the same saga in repeat. where DEX is just at the beginning and yet to hit the drama