From what I've seen of (big) ante games (tournament versions), this is true. The pot odds are so insane that it's profitable to limp with an extremely wide range, and anyone with a real hand has to risk a very large chunk of their stack in order to generate fold equity, so they'll only make the large raise with a very narrow range. In practice in those games, you'll often see 4 limps and then a 35bb jam, or something like that. More commonly, there will be 6 or 7 players to a flop.

Ok I’m gonna ramble about flop betsizing for fun.

Full stack no limit holdem

I raise cutoff 3x, small blind folds, big blind calls.

Flop:

AAKr

Checks to me, if I’m betting this flop? I click the pot button.

Flop:

AT2r

Checks to me, if I’m betting this flop? I click 1/2 pot and then increase the bet a little hoping to land somewhere around 2/3 to 3/4.

Flop A42r

If I’m betting then it’s 1/2 pot.

The aces deserve a paragraph of rambling inserted here.

Flop:

KT5r

I’m betting 2/3 to 3/4.

QJ9r

I’m betting pot.

QT8

I’m betting 3/4 plus a click.

Q94r

I’m betting 2/3 to 3/4.

The queens deserve a paragraph or two inserted here.

I’m actually at a friends house so I’m just gonna leave this here for now.

I like all of these sizings, Bob, though I know there will be many that prefer smaller sizes. The floor is yours, preach the merits of bet size.

AAKr => small bet. Potting it loses your customer when you have him crushed, and charges yourself too much with your Broadway draws when you're way behind. Think about when you have aces, kings, AK, or AQ on that board. How do you get paid when card removal/blockers means villain often folds to a big bet? If you go small you can get called by underpairs and draws that are drawing dead.
FWIW, Snowie suggests quarter pot with 78% of range is ideal. If I force it to use a pot-sized bet, it checks back 99.64% of the time. In short, it's a board where you have a massive range/nut advantage and therefore would generate a lot of fold equity by betting big, but the best hands in your range don't want villain to fold, so you should bet small instead.

AT2r => A variety of sizes seem OK, provided you balance appropriately. e.g. Go more polar if you go large. Go for more thin value/protection if you choose a small size.

A42r, as above, but a lower betting frequency overall, due to having fewer high equity hands in CO's range (e.g. no draws to the nuts).

KT5r, nothing particularly remarkable. Half pot should be fine.

QJ9r, Snowie likes pot at a fairly low frequency (25%). Both players have straights (and a lot of straight draws or pair+SDs) in their ranges, so it's not completely clear to me how this one plays out.

QT8r is not massively different to QJ9. Both players have the nuts in their ranges.

Q94r. There's nothing particularly remarkable about this one either, but like most Qxx boards in COvBB, Snowie likes potting it. I can't say I understand why, as I've not done a lot of studying of queen-high flops. :/

I just use 3/4 for pretty much everything. I sometimes pot monotone flops. AAx boards I'll 1/2 it sometimes. For paired boards I'll sometimes 1/2 it. I usually don't 1/2 OOP though. I'm betting 3/4 for pretty much everything when playing OOP.

In HU SNGs I min-raise pre. 1/2 on flop. 3/4 turn. River is variable, but 1/2 to 3/4 is standard. If flop goes check/check. I may bet 1/3 on turn or even 1/2. OOP I check every flop. If check/check, 1/2 on turn. 1/2 on river if called on turn.

I can understand potting AAKr flop if your opponent is a fish, but regs love to foooooolllld. Regs fold everything.

I think that it's a combination of pair strength and a want for protection from overcards. I chose to put up a bunch of Queen high flops for this reason as I've recently started to bet slightly larger on Queen high flops. I think this want for protection from overcards extends down to a lot of nine high flops, and to a lesser extent, some eight and seven high flops.

Regarding the AAKr flop:

When you have a reputation for being loose preflop and overaggressive postflop, you get paid here. Maybe my sizing on this board would suffer vs strong opponents? Likely.