Community crackdowns – Synology sent DMCA takedowns to GitHub repos hosting valid serial generators. “New” generators emerged with obfuscated algorithms or offline-only use cases.
QuickConnect block – Synology started remotely disabling QuickConnect for detected fake serials, reducing the value of serial generators unless users had a real Synology SN to clone.
Shared "clean" serials, warned others not to over-use them (lest the whole batch get blacklisted), and perfected the xpenology+new+serial+generator+2021