The cycling industry does a hard work making sure people think they need expensive bicycles but you can perfectly enjoycycling as a hobby without spending a fortune on it.

And in contradiction to computers, a bicycle from 40 years ago still does the same job as it did at the time, there is no software making it incompatible and it doesn't feel slower than the more modern stuff. All you need is a set of brake pads, cables, tires, chain and cassette every once in a while. All these consumables are fairly cheap if you aren't chasing the newest/highest end tech and stick to 2x9 / 2x10 speed transmissions.