Keeping a very disgruntled player in the team is not the best option for any team, they then risk selling him at the end of his contract and for free
So I too am confident that Manchester united will eventually let Antony go to Real Betis and continue his career peacefully
Although Antony ultimately joined Real Betis, he is still on Manchester United's list of players who are difficult to sell. Antony, Garnacho, Jadon Sancho, and Hojlund remain unclear about the future of their professional careers. Rumors about potential clubs are circulating daily.
Antony aligns with Real Betis' vision, and the two are eager to work together again.
Sancho is hampered by salary constraints. Garnacho is considered too expensive.
The situation of these Manchester United players is very complicated because the same players are also hindering the entire process. For example, in the case of Antony, Betis does not want to spend money to have him permanently, while Manchester United wants to sell him permanently and even Fenerbahce wanted to pay €45 million for him, but the player refused Fenerbahce, so it becomes difficult. If even Fenerbahce has €45 million, then Betis could get that amount if they really wanted him.
A report from ESPN Brasil claims Antony’s wishes to return to Betis continue to get in the way of United’s plans. Turkish outfit Fenerbahçe are said to have signalled a willingness to meet United’s demands of €45 million (£38.9 million, $52.3 million) but, despite the Red Devils wanting to accept, Antony has not given his approval to the move.
https://www.si.com/soccer/real-betis-demand-antony-transfer-decision-from-man-utdSancho's case is also another headache
https://www.si.com/soccer/why-jadon-sancho-hasnt-found-a-new-club-yetThe player is also making the whole process difficult. I see that Manchester United is making a mistake in not letting them go on loan, because if they continue not playing, they will hardly get attention from other clubs and Manchester United will hardly be able to sell them.