Default Question Play Store Possible Abuse

Good Day,

I was browsing through the play store apps. I randomly came across a few apps that looked very similar, but each had a different name as a developer. I am not sure but can someone answer me the following questions:

1) Is it possible for someone to post multiple versions of the app with slight differences under completely different developer accounts?
2) Does Google Play Store allow multiple developer accounts to be made or is it against rules/policy?
3) Why would people do that in the first place?

Thank you in advance for the responses.
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