Zapier's UI is a hot mess. If you breathe on a zap it turns off. Default names for zaps are "Untitled Zap". Pricing is very high for any sort of serious traffic. The webapp runs very slow.
But most important, no one knows how to say "Zapier". Is it ZAHpier or ZAYpier?
Because Zapier is an established business and showcases that there is market for automation tools. It is a safe bet to make by creating an alternative.
What people are missing is the fact that executing a GTM the way zapier did is more that just building the product and is actually very hard.
My experience is that for some types of integrations you see about a 70% success rate. Eventually you need something that is more reliable. Maybe you need an all in one solution that has some ETL capabilities. Maybe it’s a cost thing.
Zapier seems to be the best way to get stuff done quickly and cheaply but not the best for long term high volume use as an integration platform. At my old job we migrated a from Zapier to Integrator.io, which fixed the reliability issues but broke the low barrier to entry.