Basically, a company wants to earn money and when it takes over something that already exists, it sees a monetization potential that it wants to tap into.
The question now is how far the company will go to achieve this.
You can promise all sorts of things now to keep people engaged, and still just do it differently later to make more money. If they see an opportunity to generate 100k+ users here and make more money than with the remaining 15k hardcore users, then there is a certain probability that this path will be followed, with all the consequences. The bigger the company, the higher the probability of this path.
There is, of course, another path: Preserving the charm and soul of the game, growing and modernizing at a leisurely pace, and still making a profit. Of course, there is nothing wrong with making a profit per se, we are (thank God) not in socialism here and BB is not open source (even open source, i.e. a community project, would not manage without funding). The question is simply how hard monetization will be pushed.
For my part, I'll wait and see. If certain things become apparent here, e.g. massive schedule speeding up (significantly shortened seasons, multiple training sessions a week), microtransactions, some infantile stuff for young target groups…, then BB would no longer be for me and I would be out, one hobby less. The new owner can promise a lot now ("no pay to win", "community involvement"), time will tell what will come of it.
(Around here since 2009, long time supporter, even donated)