Would think the gliders would fall under same rules as drones, esp since most are powered like drones are! They should be considered "UAV's" just like a drone.
Yet, as we are all well aware - even some posting here on this forum - many people think VLOS does not apply to them. Maybe their "rationale" is, "well the drone manufacturers make them to fly 3-6 miles out, so why can't I fly that distance too!"
Many videos (on social media / YouTube / etc) (and posts here) do show the direct flaunting on VLOS and other rules each pilot - rec or commercial - are to abide by. VLOS is a tough rule to abide by for sure - depending in where you live and or fly. Is it fair - not really; but when are most government rules ever fair or takes into consideration many, many factors when flying a drone / UAV. Case in point - if I take off and fly from my backyard - I'd have maybe a 200 ft radius to fly in due to trees. Yet, I can safely fly outside of that and not be near people, houses, etc that if the drone happened to crash could harm. Yet, the FAA does not take any of that into consideration (or seems not) when making rules / policy. I do get they cannot cover every single flying situation either. Thus why VLOS is a HOT TOPIC. I think the farthest I've even flown my drone if between 1/4 to 1/2 mile out with spotters next to me; but some like to take it too far and go way beyond that. Some use strobes, which may or may not help; while claiming they can see them way beyond 1/2 mile. Maybe they can, maybe not; so not debating the issue. Most know the rules and with TRUST, they have no reason to say they do not - as it is a part of the test. If someone can fly "safely" past 1/2 mile; then it's their call.