I remember when cable TV started and there were no ads. You paid a small about every month and you had the blissful ad free environment. We all knew it wouldn't last and that ads would be back at full strength again. That's just the way it works. Get you in on promises of a better experience, then later on change the terms.
Do these internet titans have anything better to do with their colossal revenue other than sink it into more ways to see what we do, simply to sell it to advertisers.
Twitter was a darling, and now they want to grow up they are eating their parents (us)... for money!
Nothing more, nothing less, just a straight up money.
Imagine if Twitter was not-for-profit.