Unfortunately, this does not just happen with bucket shops but many other seemingly reputable brokers as well. Mostly not to protect the customer but their own asses as exchanges try to prevent anyone from taking advantage of fat fingers or dumb individuals. The only chance to get filled 4 or 5 percent above the market is when there are no other resting orders in between. Otherwise with each partial fill the spread is tightened and a new market established.
It sounds like you're trying to understand the fees associated with trading stocks and now considering day trading.
are you trolling? u telling me you have not made any trade between when you first paid $100 in commission for a stock trade till 2023? where have u been? have u been living in a cave? btw speaking of the stonk pep....assuming u paid $100 commission in pep which could be in the 1990's and didn't sold and held it till now...u would have a 10X bag! better luck next time!