Fingerprinting is the root cause of leaving breadcrumbs for data behind
which allows them to see accounts all belong to the same user trying to gain the system basically
	
	
		
			
				
			
			
				
				With the end of third-party cookies, fingerprinting is emerging as an alternative to traditional tracking of Internet users. Definition and use cases in this article by DinMo.
				
					
						
							
						
					
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If you are using the same device, that is one crumb you left behind that Instagram may use to link your accounts
examples of fingerprinting are
Device info: Model, OS version, screen resolution, hardware specs.
Browser/device fingerprint: User-agent, fonts, language, time zone, canvas/WebGL data.
Cookies & local storage: Can persist data between sessions.
Login behaviour: Similar patterns in usage (e.g. app version, activity times, typing rhythm).
Device ID/App identifiers: On mobile, the app can access more persistent identifiers (like IDFV on iOS or Android ID).
Sensor data: Motion sensors or gyroscope patterns (more advanced, but possible).
Touch data & interaction style etc