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If I may know what bad consequences could arise from this for Bitcoin? Because I still think that if there were more people holding Bitcoin before or after the halving it would definitely be much better for Bitcoin itself with the potential for a more valid price increase to occur. But on the one hand, you might think that the managers of the ETF will throw away Bitcoin after the increase occurs, but I would never worry about that because holders who have invested their trust in Bitcoin so deeply will not throw away Bitcoin carelessly at one time.
Bitcoin is trending sideways, that may be true. However, before the halving, I think the demand for bitcoin will increase due to FOMO and so on. People will take advantage of the halving moment to gain quick profits, it could be that after the halving a large correction occurs due to high selling pressure.
Regarding ETFs, the company will buy bitcoin in an effort to maintain its financial balance when customers sell holdings. They have to sell whenever and at any price if their reserve budget is not enough to pay their customers, so high selling pressure can make prices fall even more. There are concerns about that, but in the long term I think Bitcoin is still very likely to provide high returns to its holders.