You really seem to want to believe Bending Spoons buys companies just to shut them down, for reasons that are not entirely clear unless you believe that they're owned by a secret conspiracy made out of note-taking, file transfer and video hosting companies that is willing to engage in a multi decade plot to very slowly buy out competitors. They then shut down the acquired businesses for no clear benefit, even though they're still profitable and new competitors could easily start up. So this conspiracy (if it exists) would be very slow and not very effective in keeping down competitors, especially compared to all the other things the conspiring companies could be doing.

Each individual company Bending Spoons acquires has a limited lifespan, so if you only look at a single deal it can indeed look myopic. But the whole point of their business model is that they use the cash flow thrown off by the acquired businesses (which are much more profitable for a short while due to firing 75% of personnel) to fund the next acquisitions. This can keep going on indefinitely, or at least until there are no more businesses to acquire.