Polkadot is a good scaling alternative, competitive within the space. They recently began auctions for parachain slots, but there has not been much publicity out there on the project as of late.
Polkadot's scaling is somewhat complicated and cumbersome. Much simpler solutions using simple bridges are available (Polygon/THORChain).
At one time I was very big on Polkadot but that has since waned. I mean it is still a great project with tons of potential, but the simpler scaling solutions have interested me more.
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For more on this, check out Kevin's THORChain vs Polkadot comparison that was done for our THORChain guide.
Good explainer as to why there are better solutions than Polkadot currently on the market and why the project's popularity has started to wane.
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