coinbase wont scam you. just processing pains which is natural as theyre completely overworked right now. growing pains will happen for sure. a company in the range of billions of $ wont scam a single person for couple thousands of $.
just unrealistic and prob impossible as they prob dont even have enough time to individually do that.
when you make a purchase for btc it takes time bc the coins you buy need to be mined and verified before given to you (this is where companies make $, not from fees).