Shadow banning is not just about your proxies. Most dating apps use the usual methods of identifying you as a bot, as well as more advanced methods. Let's take ios for example - there are tons of SDKs that check you for jailbreak.
In addition, apps can give you additional "fraud score" for wrong geo, cell towers, device IDs, etc. And based on the scores, the app gives a verdict - whether to let you pass on or not. Let's say you created a hinge\tinder\match and you got activity, likes and posts. Let's say the site saw some non-hidden jailbreak records, geolocation spoofing, cell towers - and then let's say it gave you 30 fraud score - it let you through and let you use the account. After you logged in - logged out - the site saw some more information about your behavior or found some more identifiers - and added another 20 fraud score points - and you get a shadow ban. It all works roughly like this with many apps. You don't have to think there's some magic method, proxy or whatever. These are the words of scammers who want to sell any information for a high price. In the work of every app, whether it's a banking app or a dating app, there is a logic of detecting bogus users and not normal behavior.