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Agreed. Blockchain analytics software and it's ability to cluster transactions and figure out new ways to link transactions and wallets to identities is also improving drastically whereas this field didn't even exist a few years back.
That being said, it is still possible to stay anonymous but takes increasingly more effort.
Anyone who uses Bitcoin for anonymity is insane. Therefore, it is pseudonymous, not completely anonymous! A blockchain can be viewed by anyone, anytime. The old systems are being washed away. Your security could be compromised by today's technology update and new analytics software. A centralized service keeps records of its clients' transactions.