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Under the belief that the universe should be multi-feature and informative,we employ a model-by-model comparison method to explore the possibly largestupper bound on the swampland constant $c$. Considering the interactingquintessence dark energy as the comparison model, we constrain the largeparameter space interacting dark energy model, a 12-parameter extension to the$\Lambda$CDM cosmology, in light of current observations. We obtain the largest$2\sigma$ ($3\sigma$) bound so far, $c\lesssim1.62$ $(1.94)$, which would allowthe existences of a number of string theory models of dark energy such as11-dimensional supergravity with double-exponential potential, $O(16)\timesO(16)$ heterotic string and some Type II string compactifications. Forinflationary models with concave potential, we find the $2\sigma$ ($3\sigma$)bound $c\lesssim0.13$ $(0.14)$, which is still in strong tension with thestring-based expectation $c \sim \mathcal{O}(1)$. However, combining Planckprimordial non-Gaussianity with inflation constraints, it is interesting thatthe Dirac-Born-Infeld inflation with concave potential gives the $2\sigma$($3\sigma$) bound $c\lesssim0.53$ $(0.58)$, which is now in a modest tensionwith the swampland conjecture. Using the Bayesian evidence as the modelselection tool, it is very surprising that our 18-parameter multi-featurecosmology is extremely strongly favored over the $\Lambda$CDM model.

Multi-feature universe: large parameter space cosmology and the swampland