There's two problems here:

1. The competition law people are not the data protection people. From the perspective of competition law, they only care that the playing field is leveled, they don't care if you equalize down or up.

2. The EU has fumbled the ball on GDPR by not enforcing it on the tech giants that it was intended to regulate[0], to the point where a tech company enforcing the intent of the law and not the letter of the law feels like singling out competitors.

[0] In particular, the Republic of Ireland is a rotten borough for Facebook, who has all their EU offices there.