How does Twitter even work without Tweet Marker? I can open a 3rd party app on whatever platform I am currently using and will be presented with the exact posi

How does Twitter even work without Tweet Marker? I can open a 3rd party app on whatever platform I am currently using and will be presented with the exact position of my timeline where I left it before with one of the other 3rd party apps. If they cripple their API even further, I can't see myself using Twitter anymore.