It's complex to answer. Reddit's permanent ban is too strict.

They look at your IP address, cookies, local storage, your linked IDs if you linked them (phone number, email address, Google account, Apple ID, etc.), browser metadata, your digital fingerprint like WebGL data, WiFi BSSID, the app also keeps a note of the IMEI number of your device.

And I've read this somewhere that their AI moderation keeps an eye on your language that you type in, the words you use often and activity timing. I am not sure about this claim but they probably do it. System links all these activities with accounts that have banned in the past and if they find more than 5-7 very obvious links, you get another ban.

The system stays on high alert for first 10 days of suspicious activity on your account. It gradually lowers the flagging by 30 days but its still a risky zone. One mistake and it picks the flag. You have to clean your browser before you use it again on your main browser. Uninstall and reinstall in many cases, clearing any session data, cookies and even %TEMP% files and cache files from your root folder.

I am not sure about the app though, a friend of mine had a secondary phone where he used Reddit, he was able to evade the ban only by factory data resetting the device and then installing the app from a new Google Account. I never really used the app, I am not a phone person, I use my laptop most of the times so don't know how the app thing works.