I don't understand the problem. You can either use Twitter's official clients (and get served the ads from which they profit) or you can use a third party tool

I don't understand the problem. You can either use Twitter's official clients (and get served the ads from which they profit) or you can use a third party tool that uses the ad-less API but for which the developers must pay for each API call in your place. I'm sure that research bodies and other particular institutions could strike up a deal with Twitter to get access to special keys at a much reduced price or even for free, but this concept of Twitter making avaiable themselves a way to bypass the only way they make money has always seemed crazy to me. Glad they monetized the API.