I agree with the second paragraph of steven0461's comment.

The present posting ignores the impact of signing up for cryonics / donating to VillageReach on existential risk which should outweigh all other considerations in utilitarian expected value.

I presently believe that for most people who are interested x-risk reduction, the expected x-risk reduction of signing up for cryonics is lower than that of the expected x-risk reduction of donating to VillageReach. My thinking here is that donating to VillageReach signals philanthropic intention and affords networking opportunities with other people who care about global welfare who might be persuaded to work against x-risk whereas signing up for cryonics signals weirdness to everyone outside of a very narrow set of people.

However, as Carl Shulman has remarked:

"widespread cryonics would have beneficial effects in encouraging long-term thinking."

And lsparrish has written:

As to most people not being capable of being convinced of cryonics, I strongly doubt that this is the case. It's a huge uphill battle no doubt but given enough dollars towards PR (or enough intelligently done promotion by unpaid advocates on the web) it can be done.

The beneficial impact of signing up for cryonics on x-risk reduction seems to me to be predicated on the possibility of spreading cryonics to a population positioned to decrease x-risk who would not work to decrease x-risk if they were not signed up for cryonics.