Just a theory so far...

https://www.mycast.io/stories/which-characters-would-you-like-to-see-actors-play-in-live-action/roles/jason-momoa-1/4896339

Based on this, as well as certain casting suggestions and votes on other stories, alexcrawford and bumbleprime might be the same person.

The votes on these suggestions appear to be the same:

https://www.mycast.io/stories/the-transformers/roles/jazz/3757/suggestions/keith-david/6496445

https://www.mycast.io/stories/the-transformers/roles/scrapper/22947/suggestions/nathan-fillion/10029048

https://www.mycast.io/stories/transformers-71/roles/astotrain/6378189/suggestions/djimon-hounsou/9998016

https://www.mycast.io/stories/dream-actor-actress-collaborations-t/roles/dwayne-johnson/6892539/suggestions/amy-adams/9923313

You may be right here that the user is doing this just like those Millie Bobby Brown clone accounts and the Tom Holland ones from I believe rialryan2005 back in November/December 2020.

And someone named nickt (not sure if they had an active account on here or not) used multiple accounts as seen here with these two choices.

https://www.mycast.io/stories/actors-actresses-you-would-like-to-see-in-movies-set-in-the-90s/roles/suggestions/1048948/suggestions/ciara-hanna/1975212

https://www.mycast.io/stories/face-claims-sorted-by-august-former-birthyears-and-july-latter-birthyears/roles/august-1988-july-1989/777269/suggestions/christina-masterson/2263985

Noticed the resemblance between alexcrawford or rialryan, but maybe I'm just seeing things now...

More to support this theory:

https://www.mycast.io/stories/transformers-and-g-i-joe-2-phase-2-movie-8/roles/ultra-magnus/4732794

https://www.mycast.io/stories/transformers-and-g-i-joe-2-phase-2-movie-8/roles/ratchet/4737831

https://www.mycast.io/stories/transformers-and-g-i-joe-2-phase-2-movie-8/roles/shockwave/4739841

https://www.mycast.io/stories/which-characters-would-you-like-to-see-actors-play-in-live-action/roles/josh-brolin/2791536/suggestions/long-john-silver-treasure-planet/6945010

Also, this might be the same person: https://www.mycast.io/profiles/56197/username/lupitaq