I think a lot of commentor here forget that Canva is a large, profitable company that has a long track record of putting its consumers first. I'm not going to pretend that the fruit won't ever sour, but a company that wants to get more people in design, upsell them on fremium optional features, and has other profitable businesses to support the funnel is a hell of a lot better than Adobe.
If Serif was going to be acquired, I can't think of a better company to have done it.