it'll be 'easy to break up' because that's what Alphabet was created to do - back in 2015 they knew antitrust and a monopoly break-up was going to happen at some point, so they made these companies largely operationally separate so that they have very little hiccup when it is required. The only one that'd be hard is YouTube where they might require spending some millions reworking the ad model, but otherwise they'll have little issues continuing business as usual. YouTube is likely profitable[0], so it's not like their monopoly over free video content is going to cease.

0: https://www.theverge.com/2020/2/3/21121207/youtube-google-al...