When did you say 5 digit accounts?Check back your post and there were no mention of 5 digit.
What you said were they offer high leverage account and then switch to low leverage account to force your your loss due to losing positions on low leverage.
And I never heard forex brokers change leverage when your account grow.
And I know plenty forex brokers offer 500:1 leverage on 7 digit accounts.
This is the links your post provided.
https://www.litefinance.org/trading/account-types/cent/
https://www.hfm.com/sv/en/
Tell me where on their web they say they would change leverage if your account grow?
Or you meant they don't tell that but when your account grow they would do that without any mention on their web? Then you are accusing them treating.
Stop spreading false information.