If you want to get into RF, and not just for hacking a few specific protocols, an RTL-SDR is a better choice and much, much cheaper than a Flipper Zero. For $40 on Amazon you can get an RTL-SDR.com kit complete with antennas that will let you capture data from smart meters, aircraft beacons, police radio, and even detect individual cars driving nearby by capturing serial numbers from their TPMS sensors.
I mean, if I had the disposable income I’d get a Flipper Zero to mess around with, but it’s not on my list of things I need for my hardware hacking go-bag.
What’s the need you’re trying to fill?