Are Roster: The MO world has a far far far higher OTD rate in general. Rabbi Steven Pruzansky, eminent MO rabbi from Teaneck, wrote that about 50% of MO university students (which is close to all MO post-high school kids) go OTD while in college. You hear that? 50%!! Another study indicated that overall MO have a 25% OTD rate.
Reb Eliezer: The Chareidim (Chasidish/Yeshivish) have a tiny OTD rate in the 1% range neighborhood. It is incomparably smaller than the MO rate. As such, the idea that chumras lead to going OTD is preposterous on its face. Had that been the case you’d see a larger OTD rate among Chareidim, who are known to keep chumras, than among MO, who keep kulas.