It’s not the NFL’s fault the current Browns stink. The league didn’t tell the Browns to spend lots of money drafting iffy QBs and never bother to equip them with an offensive line of WRs.
The Ravens’ continuing success comes from fixing their problems. When they got tired of being a defense only team they picked up a coach with a real (not flashy) offensive mind, got him a good QB, gave that QB a good line, and this year gave him some guys to throw to. 3 years in a row in the playoffs.