My opinion on Mastinator: I don't get it!
I've tried to figure out how this service works, and it's confusing as hell!
It advertises "disposable public anonymous no-login Fediverse accounts." Which sounds scary.
But then you can't send posts!
And I've never actually been able to successfully follow any account either.
Which makes me wonder—why not use RSS instead? Mastodon already supports that.
Bottom line—if I'm having trouble with this, I don't think anyone else is faring well.