alt Hacker NewsA concrete counterexample: plantura.garden is a large, reputable German-language gardening magazine / brand, and probably exactly the kind of legitimate site one would expect on .garden.
So while the abuse numbers may well justify treating newly registered / low-reputation .garden domains with suspicion, blanket-blocking the entire TLD seems like it would create real collateral damage.
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I don't think that anyone claims that there aren't any legitimate sites on .garden, but the risk of using an abuse-prone TLD is that Bayesians are going to assign you an increased prior risk of abuse. Honestly the TLD is making more money from the abusers than from Plantura so they're not going to tighten up their ship, Plantura should probably move to a different TLD.
For businesses, it's not a valid reason to not block .garden simply because a gardening site exists. If a site is important enough, exceptions to the blanket rule can be applied.
In general though, if you want Fortune 500s to utilize your service/company, don't utilize a novelty TLD.