I've choked the fuck out of more than one gear head in competition. It doesn't make your carotid arteries any stronger.
It's certainly frustrating to train with people who you know have an unfair advantage, but what you find out over time is that A. it's pretty hard to sustain big gains and train BJJ seriously so a lot of those guys quit pretty fast since they tend to more focused on aesthetics than martial arts and B. brute strength is not anywhere close to the most useful physical attribute for jiu jitsu. Most professional grapplers who juice don't do it to get huge (it's a weight class sport after all), they do it to train more and recover from injuries more quickly. Chances are the really good grapplers you may have rolled with who are on the gear you have no idea, because they don't look like body builders. They look like Rafa Mendes. You'll get the occasional guy like Leandro Lo or Pablo Popovich who carry a ton of lean muscle while also training all the time, but that's the exception rather than the rule. The great champions in BJJ were most likely all using at some point in time, but guys like Marcelo and Roger were never hugely muscular. Overall I wouldn't worry about it, it's a part of every sport and generally speaking it doesn't convey nearly the edge people think it does (at least among amateurs. For pros, small difference in strength, endurance, and ability to train more matter a great deal but that's the tip of the pyramid and not very relevant to you and I).