Spam detection at Twitter is horrendous. Search results for many crypto and stock ticker symbols (or cashtags like $SOFI) are deluged with Discord links for shady trading groups endlessly trying to rope in paid subscribers. If you select "top" search results, you'll see much less spam but stale tweets. "Latest" yields tons of spam. They've been tweeting with the same phrases like "don't miss the next move in a few hours" and "top analyst price target" for years, presumably because it's never been a priority to get rid of them.
Buying an account doesn't give you un-suspendable account.
All spam detection techniques are applied to paid accounts and they are removed as well.
This not only raises the cost but difficulty.
Just having money is not enough. Detecting 10+ payments from the same credit card is trivial.
There aren't infinite amounts of valid credit cards or Apple accounts to be used for verification.